Continuing on from #1139 this PR deletes all function that are not used
anywhere.

The next PR will include all the entire files that are unused & deleted.

As discussed in #1126 creating separate PRs.

The linter rule isn't actually part of this first PR and will likely be
in the final PR as otherwise it will just fail because all the issues
aren't resolved.

The code is 'ready' though so as soon as this is merged I will open next
one(s)

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>