OK
The first step of replacing the legacy vB buttons with fonts icons from
Font Awesome is done.
Of course, there is a lot of legacy code and buttons, so I might have missed something, in fact I'm sure I did; so if you see any old legacy buttons please post a link and a screen shot attachment (if you can).
Also, I want to again thank Brad Traversy and his awesome YT channel,
Traversy Media, for pointing me in this direction.
Thanks.