Normalize repositories

[gr2m]

This could be a serious about normalizing repository settings with tools such as @octoherd and the settings app

Inspired by @oscard0m's sync-repo-settings script, see https://github.com/octoherd/octoherd/discussions/22

Things I'd like to normalize

• [ ] only permit squash for merging
• [ ] enable auto merging
• [ ] delete branches after merging
• [ ] disable wiki unless there is any wiki content
• [ ] disable projects unless there is a project
• [ ] normalize tests in multiple node versions
• [ ] use main as default branch with according release settings in package.json and .github/workflows/release.yml