Add runna to repos.yml, and drop build-tool from argh - #2

repos.yml gets an entry for nullean/runna, so apply-repo-settings.sh can give it the shared settings and its main ruleset, and argh loses the build-tool topic.

Prompt summary: Make left nullean/argh as its own repository, runna, with its own site at runna.nullean.net. Wire the new repository into the org settings like the others.

Why

apply-repo-settings.sh runna refuses a repository that is not in repos.yml, so runna has no ruleset or homepage settings yet. argh's build-tool topic described Make, which argh no longer carries (nullean/argh#147).

What

runna

Homepage runna.nullean.net, build-target topics, and build / ci (ubuntu-latest) as the required check: the only build job runna's CI runs on a pull request (macOS runs on main only).

argh

Same entry, without build-tool.

Verify

scripts/apply-repo-settings.sh runna --dry-run

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