Docs: Move docs folder under .github

Prevents conflict with build CI paths

Author: TasoOneAsia

docs/agnostic-theme-interfaces-proposal.md renamed to .github/docs/agnostic-theme-interfaces-proposal.md

@@ -80,10 +80,10 @@ instead of defined in `hugo.yaml` but less explicit.
 
 ```yaml
 params:
-  productSelector: ProductGroup[]
-    - productGroup: <string>
-      products: Product[]
-          # Product Group Label (Product[])
+  productSelector: <ProductGroup[]>
+    - groupLabel: <string>
+      items: <Product[]>
+          # Product Label
         - title: <string>
           # The URL prefix used for the section (Ex. 'nginx' for NGINX+). Definition not required if extUrl
           url: <string | undefined>