Add logos of organizational members to front page

[t-sommer]

fixes #92

[t-sommer]

This is what the logos look like:

[chrbertsch]

The logos look good, but the selection gives a wrong impression, which companies and organisations are active in the MA. I would display the logos of all organisational members (with smaller size)

[dzimmer]

Christian has a point.
However many small logos may fail to have the desired impact. I have seen pages that solve this problem by swapping the logos with a low frequency... In this way, all logos remain large and we could start with some big names. I have no idea how much implementation effort that would be.

[dzimmer]

I would suggest a slight rephrasing:

"supported by:"
Logos
"and 21 more organizational members"

(hence it is about the prominence of support and not whether the partner is active or not)
Agreement from me. Go ahead!