Create watercolor backed image component

[jrmerz]

This needs to:

• handle screen density
• handle screen size
• handle image
• handle (possible) label
  • which page have a second water color background behind label)

@wrenaria will provide sample watercolors

(See XD creators pages).

TODO: link to design spec issue

[wrenaria]

Watercolor samples: https://drive.google.com/drive/folders/1BX7hRF-vNYLusiQBETJzoR5uoRjH1rKd?usp=sharing

Some of these are not final form/refined, but good enough to experiment with.