Add Advanced Self Hosting Section, Improve Self Hosting, OpenAI Proxy Docs

- Add instructions for self-hosted users with info, warning boxes to
  avoid, fix common issues when setting up Khoj server
- Create new Advanced Self Hosting section
  - Extract Advanced Self-Hosting Sections from the Advanced Page and
    move them to separate Pages under Advanced Self Hosting section
- Improve OpenAI Proxy Docs
  - Put Ollama setup as a section under OpenAI API Proxy page instead
    of a separate page
  - Add Section to use Khoj with chat model from LM Studio
  - Update LiteLLM docs to use chat model from LM Studio

documentation/docs/features/all-features.md

@@ -0,0 +1,35 @@
+---
+sidebar_position: 1
+---
+
+# Overview
+
+Khoj supports a variety of features, including search and chat with a wide range of data sources and interfaces.
+
+#### [Search](/features/search)
+  - **Local**: Your personal data stays local. All search and indexing is done on your machine when you [self-host](/get-started/setup)
+  - **Incremental**: Incremental search for a fast, search-as-you-type experience
+
+#### [Chat](/features/chat)
+  - **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
+  - **Works online or offline**: Chat using online or offline AI chat models
+
+#### General
+  - **Cloud or Self-Host**: Use [cloud](https://app.khoj.dev/login) to use Khoj anytime from anywhere or [self-host](/get-started/setup) for privacy
+  - **Natural**: Advanced natural language understanding using Transformer based ML Models
+  - **Pluggable**: Modular architecture makes it easy to plug in new data sources, frontends and ML models
+  - **Multiple Sources**: Index your Org-mode, Markdown, PDF, plaintext files, Github repos and Notion pages
+  - **Multiple Interfaces**: Interact from your Web Browser, Emacs, Obsidian, Desktop app or even Whatsapp
+
+### Supported Interfaces
+Khoj is available as a [Desktop app](/clients/desktop), [Emacs package](/clients/emacs), [Obsidian plugin](/clients/obsidian), [Web app](/clients/web) and a [Whatsapp AI](https://khoj.dev/whatsapp).
+
+![](/img/khoj_clients.svg ':size=400px')
+
+### Supported Data Sources
+Khoj can understand your word, PDF, org-mode, markdown, plaintext files, [Github projects](/data-sources/github_integration) and [Notion pages](/data-sources/notion_integration).
+
+
+![](/img/khoj_datasources.svg ':size=200px')