feat: add Login and Sign Up buttons to docs header

[roomote]

Adds Login and Sign Up buttons from the Marketing site (app.roocode.com) to the Docs site (docs.roocode.com) header.

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View task on Roo Code Cloud

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Important

Adds Login and Sign Up buttons to the Docs site header, linking to the Marketing site URLs.

• Behavior:
  • Adds "Log in" and "Sign up" buttons to the Docs site header in GitHubInstallButtons.
  • Buttons link to SIGN_IN_URL and SIGN_UP_URL from constants.ts.
• Styling:
  • Adds .secondaryButton style in styles.module.css for "Log in" button.
  • Adjusts .installButton style for "Sign up" button.
• Constants:
  • Adds SIGN_IN_URL and SIGN_UP_URL to constants.ts.

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Project	Deployment	Review	Updated (UTC)
roo-code-docs	Ready	Preview, Comment	Jan 16, 2026 11:55am

[roomote]

Rooviewer   See task on Roo Cloud

All previously identified issues have been addressed. This PR is ready to merge.

• Remove erroneous font-size: 400px in src/css/custom.css that would break button styling
• Fix typo "CLoud" to "Cloud" in src/components/GitHubInstallButtons/index.tsx
• Remove unused imports in src/theme/Navbar/Content/index.tsx

Previous reviews

• 1d4752a: Review #1
• f7c0a4e: Review #2
• f7c0a4e: Review #3
• e6ee50c: Review #4

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Rooviewer   See task on Roo Cloud

Review complete. Found 3 issues that need to be addressed.

• Remove erroneous font-size: 400px in src/css/custom.css that would break button styling
• Fix typo "CLoud" to "Cloud" in src/components/GitHubInstallButtons/index.tsx
• Remove unused imports SIGN_IN_URL, SIGN_UP_URL in src/theme/Navbar/Content/index.tsx

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}