fix apiref CSS: overflowing text

In Firefox, when zoomed, some text overflows inside a floated container
and is clipped (this also happens in Firefox when the font of code is
changed).

This commit removes the floating, since for a single child element it doesn't
make sense anyway to be floated.

Close #199
playground categories and doc update

close #206
chore: print out sauce connect logs only after failrue

Closes #208
change template prefix to curly brackets

Closes #209
chore: release 0.4.0
chore: start 0.5.0 iteration