Closes #1125

Disables (hides) the "all payees" checkbox when schedules are loading.

Reproduction:
1. open `/schedule/discover`
2. while the data is still loading - click on the checkbox in the table
header
3. after loading finishes - the page crashes with an error

Further Nordigen fixes for expired bank-links. With the recent changes
to the router, we had broken this functionality.

<img width="488" alt="Screenshot 2023-06-14 at 09 00 21"
src="https://github.com/actualbudget/actual/assets/886567/8e7516e0-121a-46e0-9e52-24748b161173">
<img width="437" alt="Screenshot 2023-06-14 at 09 00 30"
src="https://github.com/actualbudget/actual/assets/886567/88b36549-1073-4269-b42f-1553c164316f">

Small bugfix for nordigen.

Do not perform the server status check if the user is actually offline.

Previously, the frontend would attempt to make real requests to
`https://not-configured/`, which of course failed. I’ve changed the
internal structure to have the lack of a server expressed as a `null`
server. A new `did-bootstrap` browser-level setting has been added to
track if the user clicked “Don’t use a server.”

Finally, I updated the auth logic for methods that call out to the
server to make them consistent and use the early return style which
reduces indentation.

Fixes #1021

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

Seems to build fine, will test later.

Depends on server change:
https://github.com/actualbudget/actual-server/pull/168

Enabling the new autocomplete for dev/preview deployments.

This will allow us to spot any more issues there might be before we
release the new autocomplete.

https://github.com/actualbudget/actual/issues/773

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).

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.

This implements a simple indicator showing the user if the currently
used version is outdated by utilising GitHub tags to track the latest
version.
Closes #463

---------

Co-authored-by: Jed Fox <git@jedfox.com>

* Allow the server to auto-configure the server URL for the client

* Extract server URL/version logic out to ensure consistent updates

* ()

* Be more explicit about when the server version is re-fetched

* Use a single layer of context provider

* Move the bootstrap route to /account/needs-bootstrap

* No more `isActual`

* Refactor to call subscribe-needs-bootstrap instead of fetch()

* Dedupe calls to subscribe-needs-bootstrap

* Don’t revalidate the server when we just validated it

* simplify

* Fix setServerURL

Co-Authored-By: Matiss Janis Aboltins <886567+matissjanis@users.noreply.github.com>

* 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

Co-authored-by: Tom French <15848336+TomAFrench@users.noreply.github.com>