Fix diff blocks, links, remove footnotes & rearrange sections in docs

Extract performance into separate sectin into shoving it under search
Create page for web interface

docs/web.md

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+<h1><img src="./assets/khoj-logo-sideways.svg" width="200" alt="Khoj Logo">Web</h1>
+
+> An AI personal assistant for your Digital Brain
+
+## Features
+- **Search**
+  - **Natural**: Advanced natural language understanding using Transformer based ML Models
+  - **Local**: Your personal data stays local. All search and indexing is done on your machine. *Unlike chat which requires access to GPT.*
+  - **Incremental**: Incremental search for a fast, search-as-you-type experience
+- **Chat**
+  - **Faster answers**: Find answers faster and with less effort than search
+  - **Iterative discovery**: Iteratively explore and (re-)discover your notes
+  - **Assisted creativity**: Smoothly weave across answers retrieval and content generation
+
+## Setup
+The Khoj web interface is the default interface. It comes packaged with the khoj server.
+
+## Interface
+![](./assets/khoj_chat_web_interface.png?)