Add Darkly dark theme

And rename Dark to Cyborg (Dark)

application/views/user/add.php

@@ -113,8 +113,9 @@
             <select class="custom-select" id="user_stylesheet" name="user_stylesheet" required>
                 <option value='default' selected="selected">Default</option>
                 <option value='blue'>Blue</option>
-                <option value='blue'>Dark</option>
                 <option value='cosmo'>Cosmo</option>
+                <option value='cyborg'>Cyborg (Dark)</option>
+                <option value='darkly'>Darkly (Dark)</option>
                 <option value='superhero'>Superhero (Dark)</option>
             </select>
         </div>

application/views/user/edit.php

@@ -93,8 +93,9 @@
                         <select class="custom-select" id="user_stylesheet" name="user_stylesheet" required>
                             <option value='default' <?php if($user_stylesheet == "default") { echo "selected=\"selected\""; } ?>>Default</option>
                             <option value='blue' <?php if($user_stylesheet == "blue") { echo "selected=\"selected\""; } ?>>Blue</option>
-                            <option value='dark' <?php if($user_stylesheet == "dark") { echo "selected=\"selected\""; } ?>>Dark</option>
                             <option value='cosmo' <?php if($user_stylesheet == "cosmo") { echo "selected=\"selected\""; } ?>>Cosmo</option>
+                            <option value='cyborg' <?php if($user_stylesheet == "cyborg") { echo "selected=\"selected\""; } ?>>Cyborg (Dark)</option>
+                            <option value='darkly' <?php if($user_stylesheet == "darkly") { echo "selected=\"selected\""; } ?>> Darkly (Dark)</option>
                             <option value='superhero' <?php if($user_stylesheet == "superhero") { echo "selected=\"selected\""; } ?>>Superhero (Dark)</option>
                         </select>
                     </div>

assets/css/darkly/overrides.css

@@ -0,0 +1,3 @@
+/*!
+ * No overrides for the default theme as it aligns with general.css
+*/