Link to recipe source file doesn't work

[scymtym]

Describe the bug

When visiting a generated project page, for example https://citkat-citec.bob.ci.cit-ec.net/project/azul-zulu-openjdk-11.0.2.xml, the link to the recipe source file at the bottom just reloads the page.

To Reproduce

Steps to reproduce the behavior:

1. Visit a project page such as https://citkat-citec.bob.ci.cit-ec.net/project/azul-zulu-openjdk-11.0.2.xml

2. Click the "Recipe-Url" link

Expected behavior

The link should point to a repository browser showing the recipe source file.

Additional context

Maybe we should embed the recipe source so that we can just show it inline?