Add the possibility to launch to game with or without bepinex and the ability to backup bepinex and restore this backup

renderer/index.html

@@ -108,6 +108,8 @@
         <div class="horizontal-div">
             <button class="default-button" onclick="installBepinex()">Install</button>
             <button class="important-button" onclick="uninstallBepinex()">Uninstall</button>
+            <button class="default-button" onclick="backupBepinex()">Backup</button>
+            <button class="important-button" onclick="deleteBepinexBackup()">Delete Backup</button>
         </div>
         <br>
         <h2>Import/Export</h2>