Migrate to using docusaurus, rather than docsify for documentation (#603)

* Add docusaurus documentation (to replace the docsify setup
* Remove older docs
* Specify documentation as the gh pages build action working directory

documentation/docs/features/search.md

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+---
+sidebar_position: 3
+---
+
+# Search
+
+Take advantage of super fast search to find relevant notes and documents from your Second Brain.
+
+### Use
+1. Open Khoj Search
+  - **On Web**: Open https://app.khoj.dev/ in your web browser
+  - **On Obsidian**: Click the *Khoj search* icon 🔎 on the [Ribbon](https://help.obsidian.md/User+interface/Workspace/Ribbon) or Search for *Khoj: Search* in the [Command Palette](https://help.obsidian.md/Plugins/Command+palette)
+  - **On Emacs**: Run `M-x khoj <user-query>`
+2. Query using natural language to find relevant entries from your knowledge base. Use [query filters](/docs/miscellaneous/advanced.md#query-filters) to limit entries to search
+
+### Demo
+![](/img/khoj_search_on_web.png ':size=400px')