Web footer: make the community section more compact, 1 line on desktop

## Before

![image](https://github.com/kleros/kleros-v2/assets/22213980/c5300dd9-b123-4b55-b0cb-2b60b46a1e63)


## After

On desktop:
![image](https://github.com/kleros/kleros-v2/assets/22213980/a117595c-48cd-4818-93cd-7440da4f7611)

On mobile:
![image](https://github.com/kleros/kleros-v2/assets/22213980/7d8114d7-cf7c-42ba-944d-ef23f92faa61)

