feat: add floating button to give feedback

public/index.html

@@ -219,6 +219,8 @@
     </div>
 </div>
 
+<button class="button is-primary floating js-modal-trigger" data-target="modal-feedback" data-i18n="give-feedback"></button>
+
 <div class="footer" aria-label="Footer">
     <div class="columns">
         <div class="column">
@@ -272,6 +274,8 @@
     </div>
 </div>
 
+
+
 <div id="modal-feedback" class="modal">
 
     <div class="modal-background"></div>