Add Context7 recommendation to Develop with AI guide

[peterargue]

Summary

Add a recommendation to use Context7 for Flow documentation within the "Develop with AI" section of the Flow docs site.

Context

Developers using AI tools to build on Flow should be pointed to Context7 as the best way to give their LLM up-to-date Flow documentation. This is a simple docs update to the existing guide.

Acceptance Criteria

• "Develop with AI" guide updated to recommend Context7
• Instructions for how to configure Context7 with popular AI tools
• PR submitted to docs repo

References

• https://context7.com/
• Discussed in AI tooling sync (Apr 1)
• Owner: Felipe Cevallos

[0xLisanAlGaib]

Context7 repos need to be cleaned up a bit before fixing the docs