initial testing with Zensical

This commit is a test run, currently I would stick with MM proper until
Zensical is more mature. Hopefully in about half a year.

Missing features:
- blog for news articles (using template at the moment, not ideal)

compose.yml

@@ -1,9 +1,8 @@
 ---
 services:
-  mkdocs:
-    build: .
-    # explicitly force live-reloading per https://github.com/squidfunk/mkdocs-material/issues/8478
-    command: serve --dev-addr=0.0.0.0:8000 --livereload
+  zensical:
+    image: docker.io/zensical/zensical:latest
+    command: serve --dev-addr=0.0.0.0:8000
     security_opt:
       - no-new-privileges:true
     volumes: