fix(readme): point stars badge at repo page not /stargazers

[code-yeongyu]

Summary

Fix the remaining /stargazers link so the stars badge/pill no longer 404s for logged-out visitors (GitHub restricted /stargazers to repo admins in July 2026).

The landing-page pill component and its e2e test already handle this (they assert no /stargazers deep links). This fixes the one remaining reference: the README stars badge now links to the repo page (/code-yeongyu/lazycodex), where the star button lives anyway.

Reported by @devswha in #122 (verified fix originally in #121, which was auto-closed by pr-source-guidance.yml). Fixed by [sisyphus-bot].

Closes #122.

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Summary by cubic

Update README stars badge to link to the repo page instead of /stargazers, avoiding 404s for logged-out visitors after GitHub’s change. Matches the landing-page pill behavior.

^{Written for commit 3fdad1e. Summary will update on new commits.}

[github-actions]

Thanks for the PR! Changes to LazyCodex land through oh-my-openagent — could you open this against omo-codex over there instead? PRs in this repository can't be merged.

If you're working with a coding agent, prompt it like this:

I opened #140 ("fix(readme): point stars badge at repo page not /stargazers") against code-yeongyu/lazycodex, but changes there land through code-yeongyu/oh-my-openagent, where the Codex implementation lives under packages/omo-codex. Read my original PR, then open an equivalent PR against code-yeongyu/oh-my-openagent. In the new PR body, link the original PR (#140), explain that it was first opened against lazycodex, and describe in detail what that PR changed and why.