reinstate docs workflow

.github/workflows/mk-bycon-docs.yaml

@@ -0,0 +1,19 @@
+name: mk-bycon-docs 
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - run: pip install mkdocs-material 
+      - run: pip install mkdocs-macros-plugin
+      - run: pip install pymdown-extensions
+      - run: pip install mkdocs-mermaid2-plugin
+      - run: pip install mdx_gh_links
+      - run: mkdocs gh-deploy --force