[Settings] Ungate, and remove old settings (#6144)

* move export car dialog

* move disableemail2fadialog

* delete old settings screens

* fix type error

* Update Navigation.tsx

* Delete AccountDropdownBtn.tsx

* remove old change handle modal

* delete add app paswords

* forgot to actually delete the change handle modal

src/lib/hooks/useCustomPalette.ts

@@ -1,14 +0,0 @@
-import React from 'react'
-
-import {choose} from '#/lib/functions'
-import {useTheme} from '#/lib/ThemeContext'
-
-export function useCustomPalette<T>({light, dark}: {light: T; dark: T}) {
-  const theme = useTheme()
-  return React.useMemo(() => {
-    return choose<T, Record<string, T>>(theme.colorScheme, {
-      dark,
-      light,
-    })
-  }, [theme.colorScheme, dark, light])
-}