docs: known issues (#2565)

* docs: FAQ CMake updates

* docs: limitations

* ci: don't over label

* docs: update CHANGELOG, add a bit more structure

* ci: label PRs with more labels, and sooner

* docs: updates from @rwgk

* docs: address @YannickJadoul's points

.github/workflows/labeler.yml

@@ -0,0 +1,15 @@
+name: PR merged
+on:
+  pull_request_target:
+    types: [opened, reopened, synchronize, edited, closed]
+
+jobs:
+  label-merged:
+    name: Changelog needed
+    runs-on: ubuntu-latest
+    if: "!(github.event.action == 'closed' && github.event.pull_request.merged == false)"
+    steps:
+    - uses: actions/labeler@main
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        sync-labels: true