docs: add deepwiki readme reference

[ferhatelmas]

What kind of change does this PR introduce?

docs update

What is the current behavior?

Documentation about internals is sparse for external contributors.

What is the new behavior?

Deepwiki provides a decent / free / automatic solution. A link in readme and it keeps indexes fresh as more requests are made.

Additional context

None

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 2a4fa0a and 0818e4f.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Added DeepWiki badge to the README
  • Fixed Markdown formatting to improve documentation clarity

Walkthrough

This pull request contains documentation updates to README.md. A DeepWiki badge was added inline alongside the existing Supabase Storage Engine badge in the header. Formatting improvements were made including removal of an empty line around the "Multi-protocol support" section and correction of code fence syntax to use proper Markdown closing backticks instead of extra backtick sequences. These are purely cosmetic and documentation changes with no impact on project functionality or public APIs.

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