doc: Remove mentions of next-usequerystate

Author: franky47

.github/ISSUE_TEMPLATE/bug_report.md

@@ -13,7 +13,7 @@ assignees: ''
 What's your version of `nuqs`?
 
 ```
--> Paste result from `cat package.json | grep -e nuqs -e next-usequerystate` here
+-> Paste result from `cat package.json | grep -e nuqs` here
 ```
 
 Next.js information (obtained by running `next info`):

README.md

@@ -34,11 +34,6 @@ yarn add nuqs
 npm install nuqs
 ```
 
-> Note: the package is moving to a new name: `nuqs` :tada:
->
-> The 1.x versions will also be available under `next-usequerystate`,
-> but 2.x onwards will only be published under `nuqs`.
-
 ### Which version should I use?
 
 | Next.js version range   | Supported `nuqs` version                                                                                                                        |