Web: Controllers cleanup (#14616)

* web: Fix issues surrounding availability of controllers during init.

web: Fix edgecase where flow does not have brand.

* web: Fix import path.

* web: Clean up mixin/controller paths.

* web: Prepare for consistent import styling.

- Prep for Storybook fixes.

* web: Update MDX types.

* web: Fix issues surrounding async imports, MDX typing, relative paths.

* web: Format. Clarify.

* web: Group module types.

web/paths/index.js

@@ -0,0 +1,19 @@
+/**
+ * @file Paths used by the web package.
+ *
+ * @runtime common
+ */
+
+/**
+ * The name of the distribution directory.
+ *
+ * @runtime common
+ */
+export const DistDirectoryName = "dist";
+
+/**
+ * The name of the static file directory.
+ *
+ * @runtime common
+ */
+export const StaticDirectoryName = "static";