added config schema for validation

.vscode/settings.json

@@ -19,4 +19,14 @@
     "python.testing.autoTestDiscoverOnSaveEnabled": true,
     "python.testing.pytestEnabled": true,
     "python.defaultInterpreterPath": "${workspaceFolder}/.direnv/dev/bin/python3",
-}
+    "yaml.schemas": {
+        "https://squidfunk.github.io/mkdocs-material/schema.json": "mkdocs.yml"
+    },
+    "yaml.customTags": [
+        "!ENV scalar",
+        "!ENV sequence",
+        "tag:yaml.org,2002:python/name:materialx.emoji.to_svg",
+        "tag:yaml.org,2002:python/name:materialx.emoji.twemoji",
+        "tag:yaml.org,2002:python/name:pymdownx.superfences.fence_code_format"
+    ]
+}