Merge pull request #1377 from syucream/feature/categories-docs

Add documentation for Categories feature

docs/content/advanced/categories.md

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+# Categories
+
+Categories in Pagoda help you organize and group related entities for easier navigation and management. Think of categories as customizable collections of links to your entity sets.
+
+## Features
+
+- **Flexible Grouping**: Create categories to group related entities together
+- **Multiple Entity Association**: Link multiple entities to a single category
+- **Search & Filter**: Quickly find categories using the search functionality
+- **Priority Setting**: Control the display order of categories
+- **Notes**: Add descriptions or additional information to categories
+
+## Managing Categories
+
+### Creating a Category
+
+1. Click the "Create New Category" button
+2. Fill in the required information:
+   - Name: Category identifier
+   - Notes: Additional information or description
+   - Models: Select one or more entities to include
+   - Priority: Set display order (lower numbers appear first)
+
+### Viewing Categories
+
+Categories are displayed in a grid layout, showing:
+- Category name
+- Associated entity links
+- Quick access to entity data
+
+### Searching Categories
+
+Use the search box to filter categories by name.
+
+### Editing Categories
+
+Click the menu icon (⋮) on a category card to:
+- Edit category details
+- Delete the category