Fix the order of blocks in the footer

The blocks in the footer are now ordered correctly with flexbox.

Signed-off-by: Emanuele <feliziani.emanuele@gmail.com>
Social links are now variables

Social links are now passed through variables and injected into the social-template.

This might also be done in the future for all links, in order to have a centralized control for urls. Might come in very handy in the future.

Signed-off-by: Emanuele <feliziani.emanuele@gmail.com>