Give DDS Web a title, GitHub link, and FAQ

[tameware]

Summary

• Add a visible DDS Web heading, tagline, and document title so the page reads as a product surface
• Link to the dds-bridge/dds repository from the header
• Add a short FAQ (what it is, privacy, how to play) with matching HTML tests

Test plan

• python3 -m unittest web.tests.test_web_html (or bazelisk test //web:dds_web_html_test)
• Open web/dds_web.html (or GitHub Pages) and confirm header, GitHub link, and FAQ expand/collapse
• Smoke a sample deal to confirm deal entry and solving still work

Made with Cursor

[Copilot]

🟢 Approval recommended

Static review found no blocking issues in these scoped presentation changes; tests were not executed.

No open issues 🎉

What changed in this PR

Adds a clearer identity and introductory guidance to the DDS browser interface.

Changes:

• Adds a visible title, tagline, and GitHub repository link.
• Adds a collapsible FAQ covering purpose, privacy, and play.
• Adds matching styles and HTML checks.

File	Description
web/​tests/​test_web_html.py	Checks the title, repository link, and FAQ content.
web/​dds_web.html	Adds the header and FAQ while preserving existing controls.
web/​dds_web.css	Styles the header, deal-entry hint, and FAQ.

_{Review effort: Balanced}