Link to issue tracker in footer

[otytlandsvik]

✨ Add a link to the issue tracker in the website footer

The link should say something like

Rapportér feil

or something to that effect

🔀 Could also be a general link to the repo

Since we want to recruit developers, it might be a good idea to have a link say

Bidra til utviklingen av nettsiden!

Alternatively, we could have a new link cluster (multiple links) dedicated to the github

💬 Could also contain link to page

We could also create a page on td-uit.no explaining the website repositories and how to contribute in an easy to understand way with links to resources like react tutorials, a guide to using the github and issue tracker and so on.