Thanks, craftyguy!
- UI is selectable with `pmbootstrap init`. Currently only 'weston' and 'none' are options. It'll automatically pick up any new `postmarketos-ui-*` packages added at later dates.
- splits off weston packages install from postmarketos-base and puts
them into postmarketos-ui-weston. Also note that NO weston packages are
installed by "pmbootstrap install" by default unless the user selects a ui in the `init`
- configuration of weston is now in postmarketos-ui-weston.
- the demos have been spun off to `postmarketos-demos`, and `postmarketos-ui-weston` lists this package as a dependency.
firefox-esr is not apackaged on Alpine for aarch64 right now.
As firefox is just a demo in the current state, it will be left to
the user to add it to his installation with the --add flag, so this
will not break the install step anymore.
