Migrate swh-web icons (Font Awesome ones, octicon commit, png images) to their
Material Design Icons counterparts in order to get a consistent icons style (see
screenshots below).
Material Design Icons is an open source and exhaustive icons collection
allowing designers and developers targeting various platforms to download icons
in the format, color and size they need for any project.
Before: {F3905384}
After: {F3905384}
Closes T2445