docs: simplify quickstart guide links

Address review feedback from @domdomegg to simplify the quickstart
links by removing the anchor to a specific step. Users should see
the full quickstart including verification, and simpler links are
more robust if docs reorganize.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>