main/postmarketos-ui-phosh: Modernize description
* main/postmarketos-ui-phosh: Modernize description
While a lot of Phosh development still happens on and for the Librem 5
we (thankfully) have lots of users and contributors using other devices.
Update the description to reflect that.
Ideally we'd emphasize that this is GNOME technology based and uses
wlroots / Wayland but I didn't want to make the description too long.
* main/postmarketos-ui-phosh: Update URL
Instead of Purism's generic home page point to phosh.mobi which has some
more details. An alternative URL would be https://puri.sm/pureos/phosh/
but that points to a page that is a currently a bit dated.