feat: platform documentation update

[gyan-sharma]

Major updates to the platform documentation to enhance usability, completeness, and clarity across developer journeys. The changes include structural improvements, updated content, and removal of outdated sections.

Key Additions and Updates

1. Homepage Redesign & Navigation

   • Introduced a refreshed homepage layout
   • Improved documentation grouping and sidebar navigation for better user flow

2. User Profile End-to-End Example

   • Added a comprehensive walkthrough showcasing the full developer journey:
     • Smart contract creation
     • Subgraph and indexing setup
     • Integration with Graph Middleware
     • API portal exposure and testing

3. Knowledge Bank Section
   New section added to house conceptual guides and development best practices

4. Supported Blockchains Overview
   Introduced a dedicated section on supported networks

5. Summary & Keyword Enhancements
   Added summaries and keyword blocks to all major pages for quick scanning and contextual relevance

6. Platform Image Updates
   Replaced outdated visuals with current screenshots of the platform interface

7. EVM & Fabric Protocol Guide Revisions
   Updated guides with latest screenshots, architecture flows, and configuration examples

8. Cleanup of Deprecated Content
   Removed redundant and outdated sections no longer relevant to the current platform capabilities

[sourcery-ai]

The pull request #244 has too many files changed.

We can only review pull requests with up to 300 changed files, and this pull request has 491.