Fine-tuning small screen layout.
With #10 (closed) soon out of the way, there are still smaller things:
The Kwant workflow image looks tiny when scaled; it can probably be reworked to use the grid system.
/community, the mailing list sign up forms don't fit into
Many images in
/are too large at the upper border of small screen sizes (they take full width).
Some text in
/is too wide at intermediate screen size
~900px(reaches the border). EDIT: Fixed via !10 (merged).
EDIT: Added the last item.