Rename base package to git.monogon.dev/source/smalltown.git

This ensures that the package is go get-able in our managed environment,
which has SSH configs for git.monogon.dev by default.

go knows that it's a Git repo by matching on ".git"
(see: https://golang.org/cmd/go/#hdr-Remote_import_paths).

The package name is a bit more unwieldy than it needs to be, so maybe
we should add go-import metadata to git.monogon.dev at some point
(which is not straight-forward, since Go does not understand SRV records,
so this needs to be added to the Phabricator web server).

Also refreshed all generated files and go.mod/go.sum.

Test Plan:
    make cmd/mkimage/mkimage
    make cmd/init/init

X-Origin-Diff: phab/D193
GitOrigin-RevId: 766325ccd9a51d04eba0e49269c530c520444193
5 files changed
tree: 3caf6bf0363c00472cd1f3ceada351a142542cf7
  1. cmd/
  2. internal/
  3. kernel/
  4. patches/
  5. pkg/
  6. scripts/