Add GitHub repository and commit links to version and build details

[smonolo]

Summary

Currently on the version details page (/projects/{project}/version/{version}), there are no links to GitHub for the project repository or the builds' originating commits. Users and developers inspecting builds must manually copy the 40-character commit SHA and search for it on GitHub to view changes, diffs, or associated PRs.

Proposed Solution

• Repository Link: Add a "Repository" link under the General metadata section (e.g. PaperMC/Paper) pointing to the GitHub repository.
• Build Header Link: Add a "GitHub" link button in each build card header adjacent to the "API" button linking directly to the originating commit.
• Clickable Commit SHA: Display the short commit SHA as a clickable link to the commit diff on GitHub, accompanied by a one-click copy button for the full SHA.