No link back to audacity github

There is no link back to the audacity github repository.

Its very odd to be touting open-source and having the community contribute but not having a way for users to navigate to the source code easily from the projects website.

There is a download source button, that only links to the tarball. I would argue the repository releases should be linked instead as well as making an appearance in the footer under "links" or "downloads".

Start by locating the website source for the existing “download source” button and the footer’s “links” or “downloads” section. Add an easy-to-find link to the Audacity GitHub repository and its releases as appropriate, then verify both links appear and navigate to the intended pages.

Written by the indexing model from the issue text.