Giscus discussion links are incorrectly generated for code-quality section pages

[Huinno-ParkJinHyun]

Description

When Giscus creates GitHub Discussions for pages in the /code-quality/ section, the generated links within the discussion body are missing
the /code-quality/ base path.

Example

You can see this issue in existing discussions:
https://github.com/toss/frontend-fundamentals/discussions?discussions_q=%2Fcode%2F

Try clicking any link within these discussions - they lead to 404 pages because the /code-quality/ prefix is missing.

Specific example:

• Page: https://frontend-fundamentals.com/code-quality/code/examples/submit-button.html
• Discussion: 같이 실행되지 않는 코드 분리하기 | Frontend Fundamentals #60
• Problem: Links in the discussion show as /code/examples/... instead of /code-quality/code/examples/...

Current Behavior

• Pages under /code-quality/code/examples/ have their links incorrectly generated as /code/examples/...
• The /code-quality/ prefix is being stripped from the URL
• This issue only affects the code-quality module, not other modules (a11y, bundling, debug)

Expected Behavior

Links should maintain the full path: /code-quality/code/examples/...

Root Cause

The issue occurs because:

1. The code-quality module has a subfolder named /code/
2. When Giscus parses the HTML, it incorrectly interprets relative paths
3. The base path /code-quality/ is not properly recognized during link generation

Proposed Solution

Add a <base> tag to the HTML head to explicitly define the base URL:

head.push(["base", { href: "/code-quality/" }]);

This ensures all relative links are correctly resolved with the module's base path.