docs: merge v11 release guides and adjust links (#2189)

Author: arnautov-anton

docusaurus/docs/React/basics/getting-started.mdx

@@ -125,7 +125,7 @@ The [`Channel`](../components/core-components/channel.mdx) component is a React
 It provides five separate contexts to its children:
 
 :::caution
-`EmojiContext` has been removed in version `11.0.0`, see related release guides (["Reactions 11.0.0"](../release-guides/reactions-v11.mdx), ["EmojiPicker 11.0.0"](../release-guides/emoji-picker-v11.mdx) and ["emojiSearchIndex 11.0.0"](../release-guides/emoji-search-index-v11.mdx)) to adjust your integration to this new change.
+`EmojiContext` has been removed in version `11.0.0`, see related release guides ([Introducing new reactions](../release-guides/upgrade-to-v11.mdx#introducing-new-reactions), [Dropping support for built-in `EmojiPicker`](../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojipicker) and [Dropping support for built-in `EmojiIndex`](../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojiindex)) to adjust your integration to this new change.
 :::
 
 - [`ChannelStateContext`](../components/contexts/channel-state-context.mdx) - stateful data (ex: `messages` or `members`)
@@ -182,7 +182,7 @@ The SDK is equipped with features designed to facilitate seamless integration, e
 
 Starting from version `11.0.0`, these features are entirely optional, requiring integrators to opt-in manually. The decision was made in conjunction with enhanced architecture, aiming to reduce the overall size of the final bundles of our integrators.
 
-Make sure to read ["EmojiPicker 11.0.0"](../release-guides/emoji-picker-v11.mdx) and ["emojiSearchIndex 11.0.0"](../release-guides/emoji-search-index-v11.mdx) release guides for more information.
+Make sure to read ["Dropping support for built-in `EmojiPicker`"](../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojipicker) and ["Dropping support for built-in `EmojiIndex`"](../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojiindex) release guides for more information.
 
 ## Summary
 

docusaurus/docs/React/components/contexts/emoji-context.mdx

@@ -5,7 +5,7 @@ title: EmojiContext
 ---
 
 :::caution
-`EmojiContext` has been removed in version `11.0.0`, see related release guides (["Reactions 11.0.0"](../release-guides/reactions-v11.mdx), ["EmojiPicker 11.0.0"](../release-guides/emoji-picker-v11.mdx) and ["emojiSearchIndex 11.0.0"](../release-guides/emoji-search-index-v11.mdx)) to adjust your integration to this new change.
+`EmojiContext` has been removed in version `11.0.0`, see related release guides ([Introducing new reactions](../../release-guides/upgrade-to-v11.mdx#introducing-new-reactions), [Dropping support for built-in `EmojiPicker`](../../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojipicker) and [Dropping support for built-in `EmojiIndex`](../../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojiindex)) to adjust your integration to this new change.
 :::
 
 The `EmojiContext` is established by the `Channel` component and exposes the `useEmojiContext` hook. This context holds

docusaurus/docs/React/components/core-components/channel.mdx

@@ -183,30 +183,30 @@ Optional configuration parameters used for the initial channel query. Applied on
 In the example below, we specify, that the first page of messages when a channel is queried should have 20 messages (the default is 100). Note that the `channel` prop has to be passed along `channelQueryOptions`.
 
 ```tsx
-import {ChannelQueryOptions} from "stream-chat";
-import {Channel, useChatContext} from "stream-chat-react";
+import { ChannelQueryOptions } from 'stream-chat';
+import { Channel, useChatContext } from 'stream-chat-react';
 
 const channelQueryOptions: ChannelQueryOptions = {
   messages: { limit: 20 },
 };
 
 type ChannelRendererProps = {
-    id: string;
-    type: string;
+  id: string;
+  type: string;
 };
 
-const ChannelRenderer = ({id, type}: ChannelRendererProps) => {
+const ChannelRenderer = ({ id, type }: ChannelRendererProps) => {
   const { client } = useChatContext();
   return (
     <Channel channel={client.channel(type, id)} channelQueryOptions={channelQueryOptions}>
       {/* Channel children */}
     </Channel>
   );
-}
+};
 ```
 
 | Type                  |
-|-----------------------|
+| --------------------- |
 | `ChannelQueryOptions` |
 
 ### CooldownTimer
@@ -229,8 +229,8 @@ Custom UI component for date separators.
 
 Custom action handler to override the default `client.deleteMessage(message.id)` function.
 
-| Type                                                                                                                      |
-|---------------------------------------------------------------------------------------------------------------------------|
+| Type                                                                                           |
+| ---------------------------------------------------------------------------------------------- |
 | `(message: StreamMessage<StreamChatGenerics>) => Promise<MessageResponse<StreamChatGenerics>>` |
 
 The function can execute different logic for message replies compared to messages in the main message list based on the `parent_id` property of `StreamMessage` object:
@@ -330,15 +330,15 @@ Custom search mechanism class to override default `NimbleEmojiIndex` class from
 
 ### emojiSearchIndex (available since `11.0.0`)
 
-Custom search mechanism instance or object to enable emoji autocomplete. See ["emojiSearchIndex 11.0.0"](../../release-guides/emoji-search-index-v11.mdx) release guide for more information.
+Custom search mechanism instance or object to enable emoji autocomplete. See ["Dropping support for built-in `EmojiIndex`"](../../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojiindex) release guide for more information.
 
 | Type   | Default   |
 | ------ | --------- |
 | object | undefined |
 
 ### EmojiPicker (changed in `11.0.0`)
 
-Custom UI component to override default `NimblePicker` from `emoji-mart`. Markup structure changed in `11.0.0`, see ["EmojiPicker 11.0.0"](../../release-guides/emoji-picker-v11.mdx) release guide for more information.
+Custom UI component to override default `NimblePicker` from `emoji-mart`. Markup structure changed in `11.0.0`, see ["Dropping support for built-in `EmojiPicker`"](../../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojipicker) release guide for more information.
 
 | Version | Type      | Default                                                                                                  |
 | ------- | --------- | -------------------------------------------------------------------------------------------------------- |

docusaurus/docs/React/components/message-components/reactions.mdx

@@ -7,7 +7,7 @@ title: Reactions
 import GHComponentLink from '../../_docusaurus-components/GHComponentLink';
 
 :::caution
-If you're moving from older versions to `11.0.0` then make sure to read ["Reactions 11.0.0"](../../release-guides/reactions-v11.mdx) release guide to help you transition to the new implementation.
+If you're moving from older versions to `11.0.0` then make sure to read ["Introducing new reactions"](../../release-guides/upgrade-to-v11.mdx#introducing-new-reactions) release guide to help you transition to the new implementation.
 :::
 
 The Stream Chat API provides built-in support for adding reactions to messages. The component library provides three default components to enable reaction selection and display:

docusaurus/docs/React/guides/customization/emoji-picker.mdx

@@ -7,7 +7,7 @@ title: Emoji Picker
 import CustomEmojiPicker from '../../assets/CustomEmojiPicker.png';
 
 :::caution
-Note that this guide is for versions lower than `11.0.0`, the new API has slightly changed. See the ["EmojiPicker 11.0.0"](../../release-guides/emoji-picker-v11.mdx) release guide to help you transition smoothly to the new API.
+Note that this guide is for versions lower than `11.0.0`, the new API has slightly changed. See the ["Dropping support for built-in `EmojiPicker`"](../../release-guides/upgrade-to-v11.mdx#dropping-support-for-built-in-emojipicker) release guide to help you transition smoothly to the new API.
 :::
 
 In this example, we will demonstrate how to create a custom Emoji Picker component that can be used in the `MessageInput`. This component will replace the default [`EmojiPicker`](https://github.com/GetStream/stream-chat-react/blob/master/src/components/MessageInput/EmojiPicker.tsx) with only breakfast food emojis.

docusaurus/docs/React/guides/theming/reactions.mdx

@@ -8,7 +8,7 @@ import CustomReactionSelector from '../../assets/CustomReactionSelector.png';
 import CustomReactionsList from '../../assets/CustomReactionsList.png';
 
 :::caution
-If you're moving from older versions to `11.0.0` then make sure to read ["Reactions 11.0.0"](../../release-guides/reactions-v11.mdx) release guide to help you transition to the new implementation.
+If you're moving from older versions to `11.0.0` then make sure to read ["Introducing new reactions"](../../release-guides/upgrade-to-v11.mdx#introducing-new-reactions) release guide to help you transition to the new implementation.
 :::
 
 In this example, we will demonstrate how to override the library's default reaction set, which can be found stored as the