Create /tag/tag-name route and page to display single tag

Amolith opened

Take inspiration from the single commit page. Link the tag title from pkg/web/templates/tags.html to the new pkg/web/templates/tag.html page. Include appropriate authorship, co-authorship, timestamp, and links to the commit/file tree pages.

Initially relevant files are

  • pkg/web/templates/tags.html
  • pkg/web/webui_tags.go
  • pkg/web/webui.go
  • pkg/web/templates/commit.html
  • pkg/web/webui_commit.go