🖼 Add more social media icons

[RVA2869]

The feature

Should we keep the circular design or keep it as close to the real logo as possible? To comply with brand guidelines.
(Not an expert in this field.)

Why?

We currently support "only" 5 social media networks, and the more the merrier. 😉

Examples and inspiration

https://simpleicons.org/
#294

[Ainali]

Our first idea was to only show the major ones in the table, due to size restrictions in the table. On each organization, we show them all.
We have an issue for localizing that selection: #154
And relevant is also the issue about X: #294

As a sidenote, we don't care at all about brand guidelines, as we only use them nominally. But we do care about the license of the files, and simple icons seems like a great resource in that regard.