feat: add warning to note options menu if note size is >0.5mb (#851)

app/assets/javascripts/components/Icon.tsx

@@ -62,6 +62,7 @@ import UnarchiveIcon from '../../icons/ic-unarchive.svg';
 import UnpinIcon from '../../icons/ic-pin-off.svg';
 import UserIcon from '../../icons/ic-user.svg';
 import UserSwitch from '../../icons/ic-user-switch.svg';
+import WarningIcon from '../../icons/ic-warning.svg';
 import WindowIcon from '../../icons/ic-window.svg';
 
 import { FunctionalComponent } from 'preact';
@@ -133,6 +134,7 @@ const ICONS = {
   unarchive: UnarchiveIcon,
   unpin: UnpinIcon,
   user: UserIcon,
+  warning: WarningIcon,
   window: WindowIcon,
 };