modules(demo): update + convert config.toml to config.yaml

Poll results 11 YAML to 6 TOML: https://discord.com/channels/722225264733716590/738922126966521907/809481717031239700

Disable CMS in demo.
Add Netlify `resources/` caching to demo.

exampleSite/netlify.toml

@@ -3,7 +3,7 @@
   publish = "public"
 
 [build.environment]
-  HUGO_VERSION = "0.80.0"
+  HUGO_VERSION = "0.81.0"
   HUGO_ENABLEGITINFO = "true"
 
 [context.production.environment]
@@ -14,3 +14,8 @@
 
 [context.branch-deploy]
   command = "hugo --gc --minify -b $DEPLOY_PRIME_URL"
+
+[[plugins]]
+  package = "netlify-plugin-hugo-cache-resources"
+  [plugins.inputs]
+    debug = true