Document repo settings (#3519)

* Document repo settings

* Update .github/repository-settings.md

Co-authored-by: Marc Pichler <marcpi@edu.aau.at>

* Update settings

Co-authored-by: Marc Pichler <marcpi@edu.aau.at>

.github/repository-settings.md

@@ -0,0 +1,39 @@
+# Repository settings
+
+This document describes any changes that have been made to the
+settings for this repository beyond the [OpenTelemetry default repository
+settings](https://github.com/open-telemetry/community/blob/main/docs/how-to-configure-new-repository.md#repository-settings).
+
+## General
+
+No changes
+
+## Collaborators and Teams
+
+* There is currently no `javascript-triagers` role
+* `javascript-maintainers` has `Admin` permission
+
+## Branches
+
+## Branch protection rules
+
+### `main`
+
+* Uncheck "Restrict who can push to matching branches"
+
+### `dependabot/**/**`
+
+There is currently not an explicit rule for this branch pattern.
+Our dependencies are managed by a bot which creates PRs from a fork.
+
+### `gh-pages`
+
+This is a special branch which we use to publish the automatically generated docs.
+It is exempt from most protections.
+
+* "Allow force pushes from everyone" (requires write permission)
+
+## Pages
+
+* Source: Deploy from a branch
+* Branch: `gh-pages` `/ (root)`