Removing `react-select` and the new autocomplete. This experiment has
failed, so cleaning things up now.

Seems to build fine, will test later.

The final `Autocomplete` refactors. After this is merged what's
remaining is to do extensive testing and address the bugs in
https://github.com/actualbudget/actual/issues/773

This PR moves `Nordigen` autocomplete to the new one without using a
feature flag. IMO this is a safe change given the simple nature of the
Nordigen autocomplete component.

Refactored all feature flags to use the new `useFeatureFlag` hook.

Also added a new functionality to this feature flag: ability to define
custom "default" value for a feature flag. This will allow us to enable
the new autocomplete component for everyone using Netlify builds
eventually (need to address some issues before doing so).

Further iterations on the new autocomplete.

1. Created `AccountAutocomplete`
2. Started using new autocomplete in `GenericInput` (used for notes
field)
3. Extracted common functionality between the three new autocompletes to
a generic component: `Autocomplete`

*  (prettier) adding trailing commas

* More commas

Closes #55

* style: enforce sorting of imports

* style: alphabetize imports

* style: merge duplicated imports

* style: enforce ordering of imports

* style: sort imports in loot-core

* style: sort imports in desktop-client

* style: sort imports in loot-design

* style: manual fixes