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/web.md

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+---
+sidebar_position: 4
+---
+
+# Web
+
+Without any desktop clients, you can get started with using Khoj on the web for chat. Bear in mind you do need one of the desktop clients in order to index and sync your data with Khoj.
+
+<h1><img src="/img/khoj-logo-sideways-500.png" width="200" alt="Khoj Logo" /> Web</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
+No setup required. The Khoj web app is the default interface to Khoj. You can access it from any web browser. Try it on [Khoj Cloud](https://app.khoj.dev)
+
+## Interface
+
+| Search | Chat |
+|:------:|:----:|
+| ![](/img/khoj_search_on_web.png) | ![](/img/khoj_chat_on_web.png) |