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/util/LoadingPlaceholder.tsx

@@ -128,6 +128,46 @@ export function NotificationFeedLoadingPlaceholder() {
   )
 }
 
+export function ProfileCardLoadingPlaceholder({
+  style,
+}: {
+  style?: StyleProp<ViewStyle>
+}) {
+  const pal = usePalette('default')
+  return (
+    <View style={[styles.profileCard, pal.view, style]}>
+      <LoadingPlaceholder
+        width={40}
+        height={40}
+        style={styles.profileCardAvi}
+      />
+      <View>
+        <LoadingPlaceholder width={140} height={8} style={[s.mb5]} />
+        <LoadingPlaceholder width={120} height={8} style={[s.mb10]} />
+        <LoadingPlaceholder width={220} height={8} style={[s.mb5]} />
+      </View>
+    </View>
+  )
+}
+
+export function ProfileCardFeedLoadingPlaceholder() {
+  return (
+    <>
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+      <ProfileCardLoadingPlaceholder />
+    </>
+  )
+}
+
 const styles = StyleSheet.create({
   loadingPlaceholder: {
     borderRadius: 6,
@@ -147,6 +187,15 @@ const styles = StyleSheet.create({
     paddingLeft: 46,
     margin: 1,
   },
+  profileCard: {
+    flexDirection: 'row',
+    padding: 10,
+    margin: 1,
+  },
+  profileCardAvi: {
+    borderRadius: 20,
+    marginRight: 10,
+  },
   smallAvatar: {
     borderRadius: 15,
     marginRight: 10,