PR #21 merged: docs: Add API docs link to admin dashboard, improve API reference

Summary

• Adds a "View API Documentation →" link in the API Keys section of the admin dashboard
• Improves API reference documentation by replacing hardcoded localhost URLs with {base_url} placeholder
• Expands authentication documentation with API key examples

Changes

Admin Dashboard

• Added link to API documentation (https://stumason.github.io/polar-flow-server/api/overview/) in the API Keys section

API Documentation (docs/api/overview.md)

• Replaced all http://localhost:8000 with {base_url} placeholder
• Added "Base URL" section explaining different environments (local, Docker, production)
• Expanded "Authentication" section with:
  • API key authentication examples
  • Reference to Admin Dashboard for key management
  • Clearer separation of User ID and Sync endpoint requirements

Test plan

• Verify link appears in API Keys section of admin dashboard
• Verify link opens documentation in new tab
• Review API documentation renders correctly on GitHub Pages