Merge tier-1 to the toplevel

Now we just have a minimal base, and what was tier-1 is now
just the default content.

We still do capture the previous conception of "tier-x" in
`packages-recommended-minimal.txt` so that people starting
from scratch can install using that.

Signed-off-by: Colin Walters <walters@verbum.org>

usr/lib/systemd/system-preset/05-bootc.preset

@@ -0,0 +1,7 @@
+# Our fallback
+enable bootc-generic-growpart.service
+
+# We enable this by default just so we can say we have automatic
+# updates on by default, like CoreOS. It's very much intended
+# to be tweaked or replaced outside of trivial scenarios though.
+enable bootc-fetch-apply-updates.timer