Light mode: more fixes & cleanup:

- Remove lots more unused files
- Make light mode toggles for Exchange and Wallet images
- Change layout for exchanges and wallets to work better at some screen
  widths (between mobile and full 1080p)
- Fix light mode styles for some dev tools, carbon calculator, Edit
  button, footer, etc.

assets/img/wallets/lightmode/xumm.svg

@@ -0,0 +1,59 @@
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