feat: remove unused theme options from the sidebar

Author: Phosphorus-M

theme/index.hbs

@@ -177,10 +177,6 @@
                             <li role="none"><button role="menuitem" class="theme" id="coal">{{ theme_option "Coal" }}</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="navy">{{ theme_option "Navy" }}</button></li>
                             <li role="none"><button role="menuitem" class="theme" id="ayu">{{ theme_option "Ayu" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="latte">{{ theme_option "Latte" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="frappe">{{ theme_option "Frappé" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="macchiato">{{ theme_option "Macchiato" }}</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="mocha">{{ theme_option "Mocha" }}</button></li>
                         </ul>
                         {{#if search_enabled}}
                         <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">