added decoupled custom module, started mathallo theme, not tested yet

web_main/themes/custom/mathallo/mathallo.libraries.yml

@@ -0,0 +1,20 @@
+# Main theme library.
+global:
+  js:
+    assets/dist/main.js: {}
+    # assets/js/main.js: {}
+  css:
+    theme:
+      assets/dist/main.css: {}
+      # assets/scss/main.css: {}
+
+vitehmr:
+  js:
+    http://localhost:5173/@vite/client:
+      type: external
+      attributes: 
+        type: module
+    http://localhost:5173/assets/js/main.js:
+      type: external
+      attributes: 
+        type: module