Add a release process

process.md

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+# Release process
+
+- Create a new branch for the release `$version` for `gir`, `gir-files`, `gtk-rs-core`, `gtk4-rs`
+- Check that the gir and gir-files submodules are up to date
+- Switch to using released versions of the dependencies
+  - keep the git urls and add the `branch` and keep `path` for the local ones
+- Ensure things are building properly
+- Run `cargo publish`
+- Create a new release from Github named `$version`
+- Add the new `$version` to `.github/workflows/docs.yml` for the `main` branch
+- Update `/latest/stable` link on `gh-pages` (sadly still manual)
+  - `git clone $repo -b gh-pages --depth=1`
+  - `cd $repo`
+  - `unlink ./stable/latest/docs`
+  - `cd ./stable/latest`
+  - `ln -sf ../$version/docs ./docs`
+- Squash the commits in `gh-pages` while you are at it
+- Update versions in master to the next one
+- 🎉