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/get-started/overview.md

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+---
+sidebar_position: 0
+---
+
+# Overview
+
+Learn about Khoj and its features.
+
+<p align="center"><img src="/img/khoj-logo-sideways-500.png" width="200" alt="Khoj Logo"></img></p>
+
+<div align="center">
+
+[![test](https://github.com/khoj-ai/khoj/actions/workflows/test.yml/badge.svg)](https://github.com/khoj-ai/khoj/actions/workflows/test.yml)
+[![dockerize](https://github.com/khoj-ai/khoj/actions/workflows/dockerize.yml/badge.svg)](https://github.com/khoj-ai/khoj/pkgs/container/khoj)
+[![pypi](https://github.com/khoj-ai/khoj/actions/workflows/pypi.yml/badge.svg)](https://pypi.org/project/khoj-assistant/)
+
+</div>
+
+<div align="center">
+<b>An AI copilot for your Second Brain</b>
+
+</div>
+
+<div align="center">
+
+[📜 Explore Code](https://github.com/khoj-ai/khoj)
+<span>&nbsp;&nbsp;•&nbsp;&nbsp;</span>
+[🌍 Try Khoj Cloud](https://khoj.dev)
+<span>&nbsp;&nbsp;•&nbsp;&nbsp;</span>
+[💬 Get Involved](https://discord.gg/BDgyabRM6e)
+
+</div>
+
+## Introduction
+Welcome to the Khoj Docs! This is the best place to get setup and explore Khoj's features.
+
+- Khoj is an open source, personal AI
+- You can [chat](/features/chat.md) with it about anything. When relevant, it'll use any notes or documents you shared with it to respond
+- Quickly [find](/features/search.md) relevant notes and documents using natural language
+- It understands pdf, plaintext, markdown, org-mode files, [notion pages](/online-data-sources/notion_integration.md) and [github repositories](/online-data-sources/github_integration.md)
+- Access it from your [Emacs](/clients/emacs.md), [Obsidian](/clients/obsidian.md), [Web browser](/clients/web.md) or the [Khoj Desktop app](/clients/desktop.md)
+- You can self-host Khoj on your consumer hardware or share it with your family, friends or team from your private cloud
+
+## Quickstart
+- [Try Khoj Cloud](https://app.khoj.dev) to get started quickly
+- [Read these instructions](/get-started/setup.mdx) to self-host a private instance of Khoj
+
+## At a Glance
+<img src="https://docs.khoj.dev/assets/khoj_search_on_web.png" width="400px" />
+<span>&nbsp;&nbsp;</span>
+<img src="https://docs.khoj.dev/assets/khoj_chat_on_web.png" width="400px" />
+
+#### [Search](/features/search.md)
+  - **Natural**: Use natural language queries to quickly find relevant notes and documents.
+  - **Incremental**: Incremental search for a fast, search-as-you-type experience
+
+#### [Chat](/features/chat.md)
+  - **Faster answers**: Find answers faster, smoother than search. No need to manually scan through your notes to find answers.
+  - **Iterative discovery**: Iteratively explore and (re-)discover your notes
+  - **Assisted creativity**: Smoothly weave across answers retrieval and content generation
+  - **Online or Offline**: Choose online or offline chat depending on your requirements