State layer cleanup: move alt-text-required into preferences and fix a bug in reminders (#1845)

* Move alt-text-required into preferences

* Fix bug: reminders now using new onboarding state

src/state/preferences/index.tsx

@@ -1,8 +1,17 @@
 import React from 'react'
 import {Provider as LanguagesProvider} from './languages'
+import {Provider as AltTextRequiredProvider} from '../preferences/alt-text-required'
 
 export {useLanguagePrefs, useSetLanguagePrefs} from './languages'
+export {
+  useRequireAltTextEnabled,
+  useSetRequireAltTextEnabled,
+} from './alt-text-required'
 
 export function Provider({children}: React.PropsWithChildren<{}>) {
-  return <LanguagesProvider>{children}</LanguagesProvider>
+  return (
+    <LanguagesProvider>
+      <AltTextRequiredProvider>{children}</AltTextRequiredProvider>
+    </LanguagesProvider>
+  )
 }