feat: redesign docs site pages, migrate legal/about to App Router, add feedback widget (#502)

* feat: update table of content style in DocsPage component

* feat: add feedback widget, redesign DocsHub, and add sidebar logo

* feat: update demo images for dark and light themes

* feat: update demo images for dark and light themes

* feat: replace logo image and remove duplicate SVG file

* feat: add LocalInstallHub component and update documentation for local installation

* feat: enhance UI by updating feature icons and descriptions, and improving layout responsiveness

* Add legal pages: Cookie Policy, Privacy Policy, and Terms of Service

- Implemented Cookie Policy page with details on cookie usage and user privacy.
- Created Privacy Policy page outlining data collection practices and user rights.
- Developed Terms of Service page defining the usage terms for the documentation site.
- Removed outdated MDX files for cookie, privacy, and terms of service.
- Updated FeaturesHub component to include new feature highlights and improved layout.

* feat: enhance GitHub data fetching to include contributor count and update CommunitySection layout

content/docs/quick_start/index.mdx

@@ -1,7 +1,7 @@
 ---
-title: Overview
-icon: BookOpen
-description: Quick start guides to get up and running with LibreChat as quickly as possible.
+title: Quick Start
+icon: Rocket
+description: Choose your setup method and get LibreChat running in minutes.
 ---
 
 <QuickStartHub />