* Revert "README: Don't recommend using as a standalone script"
This reverts commit 9763bf65c6.
zipapps work fine now that we have a single entry point. Time to
recommend them again.
* update zipapp documentation to recommend the current packaging script
Also update the website documentation to mention this at all.
- mention installing from local sources, not PyPI
- warn against --user installs, which too often screw up users that then
cannot install projects because ~/.local won't be in sudo's PYTHONPATH
- advise installing with sudo -- current versions of pip assume --user
for you rather than failing with permission errors, which is great
unless, like meson, there are compelling reasons to need to install as
root
This allows us to more easily have the documentation in sync with
the source code as people will have to document new features etc
right at the time where they implement it.