chore: move assets to app

[alexbarnsley]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #2089 into 3.0-react will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           3.0-react     #2089   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
===========================================
  Files             45        53    +8     
  Lines            298       372   +74     
  Branches          49        65   +16     
===========================================
+ Hits             298       372   +74     

Impacted Files	Coverage Δ
src/app/components/Alert/Alert.tsx	100.00% <ø> (ø)
src/app/components/Dropdown/Dropdown.tsx	100.00% <ø> (ø)
src/app/components/Form/FormLabel.tsx	100.00% <ø> (ø)
src/app/components/Select/Select.tsx	100.00% <ø> (ø)
...app/components/SideBar/SideBarItem/SideBarItem.tsx	100.00% <ø> (ø)
...ings/pages/Settings/available-settings/General.tsx	100.00% <ø> (ø)
...ins/wallets/components/SignMessage/SignMessage.tsx	100.00% <ø> (ø)
...omains/wallets/pages/ImportWallet/ImportWallet.tsx	100.00% <ø> (ø)
src/app/components/Address/Address.tsx	100.00% <100.00%> (ø)
src/app/components/Address/utils.ts	100.00% <100.00%> (ø)
... and 24 more

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