docs(codes): Add (key) codes documentation

Create codes documentation for standardized keys.

Closes #218.  Fixes #308.  Ref #21.

docs/docs/codes/_media.mdx

@@ -0,0 +1,21 @@
+import Table from "@site/src/components/codes/Table";
+
+## Sound / Volume
+
+<Table group="sound" />
+
+## Display
+
+<Table group="display" />
+
+## Media Controls
+
+<Table group="media-controls" />
+
+## Consumer Menus
+
+<Table group="consumer-menus" />
+
+## Consumer Controls
+
+<Table group="consumer-controls" />