Adopt SciTools templates

[pp-mo]

Specifically, of the current scitools templates :

• MANIFEST.in ✅
• .pre-commit-config.yaml ✅
• CITATION.cff ✅
• CODE_OF_CONDUCT.md ✅
• LICENSE ✅
• lycheeignore ✅
• benchmarks/<various...> ❌ (not yet awhile)
• github/workflows/ci-linkchecks.yml ✅
• pyproject.toml ✅