Backport: Added a place for CSS and JS.
(cherry picked from commit d36215d)
Backport: Noticed that there is a convention for that, so let's stick to it.
(cherry picked from commit 251f6ff)
Backport: Changed top namespace from Hfietz to Econemon\Bootsy and changed all class names accordingly. Also changed the name of the Bootsy package to econemon/bootsy.
(cherry picked from commit 16df34b)