[repo-display] when showing a source repo, add some context for known repo's

[pvgenuchten]

currently the source repo list (resource also available in) is quite plain, while paring the list we could add a link and a logo for the most common ones

we need to store per repo an image and a link

[fennyvanegmond]

Nice, can be a extra reason for repo's to work with us. For IMPACT4SOIL we need to check which logo tot use first (Celine, Fenny)