Add custom feeds selector, rework search, simplify onboarding (#325)

* Get home screen's swipable pager working with the drawer

* Add tab bar to pager

* Implement popular & following views on home screen

* Visual tune-up

* Move the feed selector to the footer

* Fix to 'new posts' poll

* Add the view header as a feed item

* Use the native driver on the tabbar indicator to improve perf

* Reduce home polling to the currently active page; also reuse some code

* Add soft reset on tap selected in tab bar

* Remove explicit 'onboarding' flow

* Choose good stuff based on service

* Add foaf-based follow discovery

* Fall back to who to follow

* Fix backgrounds

* Switch to the off-spec goodstuff route

* 1.8

* Fix for dev & staging

* Swap the tab bar items and rename suggested to what's hot

* Go to whats-hot by default if you have no follows

* Implement pager and tabbar for desktop web

* Pin deps to make expo happy

* Add language filtering to goodstuff

src/view/com/profile/FollowButton.tsx

@@ -1,16 +1,18 @@
 import React from 'react'
 import {observer} from 'mobx-react-lite'
-import {Button} from '../util/forms/Button'
+import {Button, ButtonType} from '../util/forms/Button'
 import {useStores} from 'state/index'
 import * as apilib from 'lib/api/index'
 import * as Toast from '../util/Toast'
 
 const FollowButton = observer(
   ({
+    type = 'inverted',
     did,
     declarationCid,
     onToggleFollow,
   }: {
+    type?: ButtonType
     did: string
     declarationCid: string
     onToggleFollow?: (v: boolean) => void
@@ -42,7 +44,7 @@ const FollowButton = observer(
 
     return (
       <Button
-        type={isFollowing ? 'default' : 'primary'}
+        type={isFollowing ? 'default' : type}
         onPress={onToggleFollowInner}
         label={isFollowing ? 'Unfollow' : 'Follow'}
       />