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/online-data-sources/_category_.json

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+{
+  "label": "Online Data Sources",
+  "position": 5,
+  "link": {
+    "type": "generated-index",
+    "description": "Online data sources for indexing via Khoj"
+  }
+}

documentation/docs/online-data-sources/github_integration.md

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+# Setup the Github integration
+
+The Github integration allows you to index as many repositories as you want. It's currently default configured to index Issues, Commits, and all Markdown/Org files in each repository. For large repositories, this takes a fairly long time, but it works well for smaller projects.
+
+# Configure your settings
+
+1. Go to [https://app.khoj.dev/config](https://app.khoj.dev/config) and enter in settings for the data sources you want to index. You'll have to specify the file paths.
+
+## Use the Github plugin
+
+1. Generate a [classic PAT (personal access token)](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens) from [Github](https://github.com/settings/tokens) with `repo` and `admin:org` scopes at least.
+2. Navigate to [https://app.khoj.dev/config/content-source/github](https://app.khoj.dev/config/content-source/github) to configure your Github settings. Enter in your PAT, along with details for each repository you want to index.
+3. Click `Save`. Go back to the settings page and click `Configure`.
+4. Go to [https://app.khoj.dev/](https://app.khoj.dev/) and start searching!

documentation/docs/online-data-sources/notion_integration.md

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+# Notion Integration
+
+The Notion integration allows you to search/chat with your Notion workspaces. [Notion](https://notion.so/) is a platform people use for taking notes, especially for collaboration.
+
+We haven't setup a fancy integration with OAuth yet, so this integration still requires some effort on your end to generate an API key.
+
+1. Go to https://www.notion.so/my-integrations and create a new integration called Khoj to get an API key.
+![setup_new_integration](https://github.com/khoj-ai/khoj/assets/65192171/b056e057-d4dc-47dc-aad3-57b59a22c68b)
+3. Share all the workspaces that you want to integrate with the Khoj integration you just made in the previous step
+![enable_workspace](https://github.com/khoj-ai/khoj/assets/65192171/98290303-b5b8-4cb0-b32c-f68c6923a3d0)
+4. In the first step, you generated an API key. Use the newly generated API Key in your Khoj settings, by default at https://app.khoj.dev/config/content-source/notion. Click `Save`.
+5. Click `Configure` in https://app.khoj.dev/config to index your Notion workspace(s).
+
+That's it! You should be ready to start searching and chatting. Make sure you've configured your OpenAI API Key for chat.