📝 Add a documentation base for Khoj! (#333)

* Add docs for more organized, accessible information detailing Khoj setup
* Delete duplicated files
* Add a coverpage without enabling it. Add logo and theme
* Remove obsidian README.md
* Add plausible script to index.html via docsify

docs/chat.md

@@ -0,0 +1,21 @@
+### Khoj Chat
+#### Overview
+- Creates a personal assistant for you to inquire and engage with your notes
+- Uses [ChatGPT](https://openai.com/blog/chatgpt) and [Khoj search](#khoj-search). [Offline chat](https://github.com/khoj-ai/khoj/issues/201) is coming soon.
+- Supports multi-turn conversations with the relevant notes for context
+- Shows reference notes used to generate a response
+- **Note**: *Your query and top notes from khoj search will be sent to OpenAI for processing*
+
+#### Setup
+- [Setup your OpenAI API key in Khoj](#set-your-openai-api-key-in-khoj)
+
+#### Use
+1. Open [/chat](http://localhost:42110/chat)[^2]
+2. Type your queries and see response by Khoj from your notes
+
+#### Demo
+![](./assets/khoj_chat_web_interface.png)
+
+### Details
+1. Your query is used to retrieve the most relevant notes, if any, using Khoj search
+2. These notes, the last few messages and associated metadata is passed to ChatGPT along with your query for a response