docs: fix recipe and study links

[tianrking]

Summary

Fix repository-relative links in the Hallmark recipes and study examples.

Root cause

The documentation files live under docs/, but their links still used paths
from their former location. As a result, the recipes index, eight live examples,
the skill references, and the study protocol link resolved outside the repository
or to a nonexistent file.

Validation

• Ran a relative-link check across docs/; all local Markdown targets resolve.
• Ran git diff --check.

[vercel]

@tianrking is attempting to deploy a commit to the Together AI Team on Vercel.

A member of the Team first needs to authorize it.

[riju568]

1. PR Description - Scroll up to the first comment box. In general, the person opening the pull request (Nutlope, in this case) has a description of what the issue is, what solution is being offered, and usually a "Why" or "Context" section.

2. Files changed Tab : Click on the "Files changed" tab. By looking at the code changes (the diffs), you can usually tell what exactly is being refactored, fixed or added.

3. Conversation / Comments Below the description you can see the conversation of the PR. If the PR was created to close/fix an issue you will also see something like "Closes #..." or "Fixes #..." - which links to the corresponding issue report where the problem is described.

4. Commits : Visit the “Commits” tab to check the commit messages of each of them. You will see a chronological sequence on the problem-solving path.

[rajpratham1]

Thanks for the contribution! The updated relative links look consistent and improve the documentation by ensuring references point to the correct locations after the project structure changes.

The changes are documentation-only, easy to verify, and improve the user experience without affecting functionality.

Looks good to me. Thanks!