fix: Keyboard accessible context menus (#1768)

- Makes menus fully accessible and keyboard driven
- Currently adds 2.8% to initial bundle size due to the inclusion of Reakit and its dependency, popperjs.
- Converts all menus to functional components
- Remove old custom menu system
- Various layout and flow improvements around the menus

closes #1766

app/utils/compressImage.js

@@ -1,7 +1,7 @@
 // @flow
 import Compressor from "compressorjs";
 
-type Options = Omit<Compressor.Options, "success" | "error">;
+type Options = { maxWidth?: number, maxHeight?: number };
 
 export const compressImage = async (
   file: File | Blob,