(1/2) [docs] Restore some missing changes (#1652)

This PR restores some changes that were lost during the docs move from
bublic to brivate.

This is part 1 of two PRs. The second one is
https://github.com/tldraw/brivate/pull/2124

### Change Type

- [x] `documentation` — Changes to the documentation only[^2]

[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version

### Release Notes

- None (Docs internals)

docs/sections.json

@@ -1,7 +1,13 @@
 [
+	{
+		"id": "getting-started",
+		"title": "",
+		"description": "",
+		"categories": []
+	},
 	{
 		"id": "docs",
-		"title": "Docs",
+		"title": "Documentation",
 		"description": "Developer documentation for tldraw.",
 		"categories": []
 	},