Added callbacks for node errors and fifo overflow

Add new doc system which should/might deploy to pages.

.gitea/workflows/docs.yaml

@@ -0,0 +1,41 @@
+name: '📚 Docs'
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'docs/**'
+      - 'mkdocs.yml'
+      - 'examples/**/*.cpp'   # snippet sources
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: linux/amd64
+    container:
+      image: python:3.12-slim
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # full history needed for mkdocs gh-deploy
+
+      - name: Install MkDocs dependencies
+        run: pip install --quiet -r docs/requirements.txt
+
+      - name: Configure git identity
+        run: |
+          git config user.name  "Gitea Actions"
+          git config user.email "actions@gitea.tourolle.paris"
+
+      - name: Build and deploy to gitea-pages branch
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          mkdocs gh-deploy \
+            --force \
+            --remote-branch gitea-pages \
+            --remote-name origin \
+            --message "docs: deploy from ${{ github.sha }}"