Reorgranised blade view files to form a convention

- Primarily moved and re-organised view files.
- Included readme within views to document the convention.
- Fixed some issues with page field select list in previous commit.
- Tweaked some route names while going through.
- Split some views out further.

Closes #2805

app/Http/Controllers/PageTemplateController.php

@@ -31,7 +31,7 @@ class PageTemplateController extends Controller
             $templates->appends(['search' => $search]);
         }
 
-        return view('pages.template-manager-list', [
+        return view('pages.parts.template-manager-list', [
             'templates' => $templates,
         ]);
     }