The goal of this commit is to adapt the website HTML/CSS/JS editor using
a 'ComponentAdapter' to website backend.
Since we reload the iframe only after editing resources, the
'_updateEditor' method was added to update UI (toggle 'resetButton'
visibility,...) and get the same behaviour (on save/reset) as before
using iframe.
See merge commit for more information.
task-2687506
xO-Tx
55f1680c74