Update outdated in-app help links to new docs site structure

The help (?) links throughout the client pointed to the old
www.audiobookshelf.org/guides/* pages, which no longer exist and
resolve to a 404. Update all of them to the current
audiobookshelf.org/docs/documentation/* locations.

client/components/modals/playlists/AddCreateModal.vue

@@ -25,7 +25,7 @@
             <div class="text-sm flex items-center justify-center text-gray-200">
               <p>{{ $strings.MessageNoUserPlaylistsHelp }}</p>
               <ui-tooltip :text="$strings.LabelClickForMoreInfo" class="inline-flex ml-2">
-                <a href="https://www.audiobookshelf.org/guides/collections" target="_blank" class="inline-flex">
+                <a href="https://audiobookshelf.org/docs/documentation/libraries/common-content/playlists" target="_blank" class="inline-flex">
                   <span class="material-symbols text-xl w-5 text-gray-200">help_outline</span>
                 </a>
               </ui-tooltip>