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/state/models/ui/shell.ts

@@ -122,13 +122,13 @@ export class ShellUiModel {
   darkMode = false
   minimalShellMode = false
   isDrawerOpen = false
+  isDrawerSwipeDisabled = false
   isModalActive = false
   activeModals: Modal[] = []
   isLightboxActive = false
   activeLightbox: ProfileImageLightbox | ImagesLightbox | undefined
   isComposerActive = false
   composerOpts: ComposerOpts | undefined
-  isOnboarding = false
 
   constructor(public rootStore: RootStoreModel) {
     makeAutoObservable(this, {
@@ -168,6 +168,10 @@ export class ShellUiModel {
     this.isDrawerOpen = false
   }
 
+  setIsDrawerSwipeDisabled(v: boolean) {
+    this.isDrawerSwipeDisabled = v
+  }
+
   openModal(modal: Modal) {
     this.rootStore.emitNavigation()
     this.isModalActive = true
@@ -200,13 +204,4 @@ export class ShellUiModel {
     this.isComposerActive = false
     this.composerOpts = undefined
   }
-
-  setOnboarding(v: boolean) {
-    this.isOnboarding = v
-    if (this.isOnboarding) {
-      this.rootStore.me.mainFeed.switchFeedType('suggested')
-    } else {
-      this.rootStore.me.mainFeed.switchFeedType('home')
-    }
-  }
 }