refactor: reorganize documentation navigation structure

[devin-ai-integration]

Documentation Navigation Restructure

This PR reorganizes the documentation navigation into four main categories:

• Build
• Manage
• Deploy
• Other

Changes

• Restructured sidebars.js to create separate sidebars for each category
• Updated docusaurus.config.js to include new navigation items
• Removed unused Segment plugin
• Preserved all existing documentation content while improving navigation structure

Testing

• Verified locally that all sidebars load correctly
• Confirmed navigation between sections works
• Tested that all content is accessible through new structure
• Checked that build process completes successfully

Notes

• No content was modified, only the navigation structure
• All existing pages maintain their URLs
• Documentation remains fully searchable

Link to Devin run: https://app.devin.ai/sessions/b1347a4c04904da1b8eb8fbcb015592e

[devin-ai-integration]

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✅ jnikhila
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Name	Status	Preview	Comments	Updated (UTC)
appsmith-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 17, 2025 4:50pm

[jnikhila]

Some comments to be addressed:

• The internal categories are not retained for all the categories. For example in Build apps - the Getting Started category should've been there and then the pages underneath it. The hierarchy is not maintained.
• The self-hosting just has installation guides. All other docs are not added. Here also the hierarchy is not maintained.
• The same applies to other categories where the hierarchy is not maintained.
• Across all categories, the sub-pages are not included.
  Another change needed is by default the introduction page should be displayed, and this page should not be a part of Build Apps.
  Ask questions if you have any.