hugo: move manuals permalink config to hugo.yaml

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

content/manuals/_index.md

@@ -4,9 +4,6 @@ description: Learn how to install, set up, configure, and use Docker products wi
 keywords: docker, docs, manuals, products, user guides, how-to
 # hard-code the URL of this page
 url: /manuals/
-# remove the /manuals/ prefix for pages in this section
-cascade:
-- url: /:sections[1:]/:slugorfilename
 notoc: true
 development:
 - title: Docker Desktop

hugo.yaml

@@ -8,6 +8,12 @@ enableInlineShortcodes: true
 taxonomies:
   tag: tags
 
+permalinks:
+  page:
+    manuals: /:sections[1:]/:slugorfilename/
+  section:
+    manuals: /:sections[1:]/:slugorfilename/
+
 markup:
   tableOfContents:
     startLevel: 2