feat: add full gdoc url support

[britneywwc]

Done

• Add full google doc link support
• Add tests
• Update README

QA

• Clone the repository and build it locally with task build
• Run Bauer on API with: task run-server
• Do a POST request with full doc link

  curl -X POST http://localhost:8080/api/v1 \
          -H 'Content-Type: application/json' \
          -d '{ "doc_id": "https://docs.google.com/document/d/15QhtNdZTw2Mk5YPnc3y1RH4R7UBi3F8dZ70bJRB8xJc/edit?tab=t.0","github_repo": "canonical/canonical","parse_only": true}'
  

• See that it goes through successfully
• Run Bauer on CLI with: task run
• Pass full doc link. Ensure you have credentials set, if not check BitWarden

  ./bauer --doc-id "https://docs.google.com/document/d/15QhtNdZTw2Mk5YPnc3y1RH4R7UBi3F8dZ70bJRB8xJc/edit?tab=t.0" \
    --github-repo britneywwc/canonical.com \
    --credentials ./credentials.json \
    --parse-only
  

Issue / Card

Fixes WD-37790

Screenshots

[If relevant, please include a screenshot.]

[muhammad-ali-pk]

Nice work! LGTM