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/clients/desktop.md

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+---
+sidebar_position: 1
+---
+
+# Desktop
+
+Get started with using the Desktop app to index any supported files with Khoj.
+<h1><img src="/img/khoj-logo-sideways-500.png" width="200" alt="Khoj Logo" /> Desktop</h1>
+
+> An AI copilot for your Second Brain
+
+## Features
+- **Chat**
+  - **Faster answers**: Find answers quickly, from your private notes or the public internet
+  - **Assisted creativity**: Smoothly weave across retrieving answers and generating content
+  - **Iterative discovery**: Iteratively explore and re-discover your notes
+- **Search**
+  - **Natural**: Advanced natural language understanding using Transformer based ML Models
+  - **Incremental**: Incremental search for a fast, search-as-you-type experience
+
+## Setup
+
+1. Install the [Khoj Desktop app](https://khoj.dev/downloads) for your OS
+2. Generate an API key on the [Khoj Web App](https://app.khoj.dev/config#clients)
+3. Set your Khoj API Key on the *Settings* page of the Khoj Desktop app
+4. [Optional] Add any files, folders you'd like Khoj to be aware of on the *Settings* page and Click *Save*
+
+## Interface
+| Chat | Search |
+|:----:|:------:|
+| ![](/img/khoj_chat_on_desktop.png) | ![](/img/khoj_search_on_desktop.png) |