We can use hooks now!

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

Improving the UX for Nordigen bank-sync account import modal.

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).

I noticed that the first run flow is suboptimal for people who want to
import an existing file from Actual/YNAB. I’ve moved the welcome modal
into the management app and set it up to appear when there are no
budgets available (which also has the benefit of allowing people to see
the modal again!)

I think there’s some weirdness around getting the modal to reappear when
deleting a budget file which I want to work out before merging this.

This PR also reorganizes the management app a bit to reduce usage of
modals (currently, hitting escape while the budget list is open leaves
you with a blank page).

<img width="539" alt="Screenshot_2023-03-18 08 53 54"
src="https://user-images.githubusercontent.com/25517624/226107462-b2b88791-1015-4397-b290-c64e7fcc0f41.png">

- [x] Ensure modal consistently appears when needed (no longer a modal!)
- [x] Fix e2e tests

Related to:
https://github.com/actualbudget/actual/issues/724#issuecomment-1455160250

Depends on https://github.com/actualbudget/docs/pull/126 to be merged
first.

Two changes here:
1. show "link account" only if actual-server is used (user is "online");
2. allow linking accounts only if Nordigen is configured (using new API
to get the status for it);

Also ported the `CreateAccount` modal to a functional component.

* Update gitignore about .idea folder

The .idea folder is generated by IntelliJ IDEA

* Add integration with Nordigen

* Fix linter

* Use longer access to the account

* Move normalizatoin of accounts to the backend side

* Fix possibility to force remove account

* Move normalization of transactions to the backend side

* Fix Settings.js after merge

* fix enableing bank sync

* delete old Settings component

* Use camelCase for nordigen/remove-account call

* WIP refactor

* Fix auto-selecting existing accounts

* Fix unlinking accounts

* Align to backend changes for Nordigen integration

* Fix AnimatedLoading

* Code review changes

* Fix TZ date issue

* rm mobile package

* rm BankSync settings section

* rm console.log

* rm comment

* applies some alignments from code review

* applies some alignments from code review

* Add prefix for nordigen specific functionality

* Use arrow char

* Add prefix f...

*  (prettier) adding trailing commas

* More commas

* Split the Settings component into multiple files (#434)
* Remove need for isMobile in CSS: lean on media queries in styles.js and glamor

Co-authored-by: Matiss Janis Aboltins <matiss@mja.lv>
Co-authored-by: Jed Fox <git@jedfox.com>

* 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

It’s still also available as a modal when editing payees