PWI improvements (#3489)

* Enable home and feeds on the PWI

* Add global SigninDialog to drive useRequireAuth()

* Tweak desktop styles

* Make the logo in leftnav PWI a clickable home link

* Add label

* Improve dialog on web

* Fix query key

* Go to home after signout from settings screen

* Filter out feeds from the discover listing for logged out users which are known to break without auth

* Update profile header follow/subscribe to give signin prompt

* Show profile feeds tabs on pwi

* Add language selector to account creation footer and pwi left nav desktop

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Co-authored-by: dan <dan.abramov@gmail.com>

src/screens/Profile/Header/ProfileHeaderStandard.tsx

@@ -220,7 +220,6 @@ let ProfileHeaderStandard = ({
                     ? _(msg`Unfollow ${profile.handle}`)
                     : _(msg`Follow ${profile.handle}`)
                 }
-                disabled={!hasSession}
                 onPress={
                   profile.viewer?.following ? onPressUnfollow : onPressFollow
                 }