Prepare for public release on Gitea: simurgarray package names, community files, Gitea templates, pseudonymised P6 probe names

.gitea/pull_request_template.md

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+## What changes
+
+## Spec items touched
+
+<!-- for example CLI-021, OUT-031; update the spec in the same pull request if behaviour changes -->
+
+## How it was validated
+
+<!-- unit tests, oracle tests you ran, datasets, numbers -->
+
+## Checklist
+
+* [ ] `ruff`, `mypy` and `pytest tests/unit` pass
+* [ ] `CHANGELOG.md` updated (Unreleased) if users would notice
+* [ ] differences from reference tools recorded in `docs/known_unknowns.md`
+* [ ] no vendor data, no genetic data of real people, no credentials