Fixes errors:

```
{ Error: Cannot find module '@babel/plugin-proposal-class-properties' from '/Users/scon/code/src/paritytech/fether/packages/fether-ui'
```

```
Failed to minify the bundle. Error: static/js/main.f19a0eac.chunk.js from Terser
TypeError: Cannot read property 'minify' of undefined
```

Fix sync rate not showing

fix: Fixes #383. Add an underlay to absorb a blur click away from the menu so nothing else in the UI clicked upon menu blur

fix: Fix txStatus race condition in sendStore

feat: Relates to #337. Part 1 of 2 - Account view - Change header account design

refactor: Rename handleMenuOpen to onOpen and same to close. Remove unnecesary isMenuOpen from child

for good measure

Might fix https://github.com/paritytech/fether/issues/379
Previously, we would resolve the promise and then set `this.txStatus`. However, resolving the promise actually redirects to `Sent` which expects `txStatus` to already be defined

fix: Relates to #324. Show link to Blockscout upon confirmed, not the first confirmation

feat: Relates to #264. SUI-based drop-down menu with Backup Account and Add Tokens

See https://github.com/sharegate/craco/issues/61.
Updating to craco 3.3.1 resolves error when trying to install dependencies and build:
```
Error: Cannot find module '~/code/src/paritytech/fether/node_modules/react-scripts/config/webpack.config.dev'
```

* Remove useless .header-container

* Add width to .account_information to fit full title width

* Use `flex-grow` instead of abbreviation `flex`

* Use justify-content: left to align account info and avatar to left and remove flex: 0 from .header-tokens

CI: add key for the cache