Updates from first deployment

git.sr.ht target was mangled.

py3-colour, builds.sr.ht, and py3-srht target versions had to be bumped
down. The first is due to a unit test error; the others are due to
unreleased versions that apparently upstream is keeping private.

Several APKBUILD files had to be updated for version numbers and
checksums. Notably, py3-pygments had to be bumped down a version. It
seems that an updated APKBUILD was pushed to the repo before an updated
apk was pushed to the mirror. I am choosing to follow the mirror as the
canonical target.

Reshaping repo

The repo is designed for use with an existing builds.sr.ht service.
Besides lacking that, I am more interested in a containerized workflow
powered by a Makefile. Package source code will live in `pkgsrc/`,
packages will be built into `pkg/`, and packaging keys will be
generated into `keys/`.

Alos trimmed the packages down to what I will build.

py3-scmsrht: upgrade to 0.22.21

py3-scmsrht: upgrade to 0.22.17

py3-*: bump pkgrel for python rebuild

py3-scmsrht: remove nodejs-npm dependency

This is not required, and in any case was renamed by Alpine.

py3-scmsrht: upgrade to 0.22.9

sr.ht/py3-scmsrht: upgrade to 0.18.1

py3-srht, py3-scmsrht: update checksums

Update py3-srht & py3-scmsrht

Add builds.sr.ht as scm.sr.ht dependency

Fix archive URL for scm.sr.ht package

Add py3-scmsrht package, update py3-srht