Move to expo and react-navigation (#288)

* WIP - adding expo

* WIP - adding expo 2

* Fix tsc

* Finish adding expo

* Disable the 'require cycle' warning

* Tweak plist

* Modify some dependency versions to make expo happy

* Fix icon fill

* Get Web compiling for expo

* 1.7

* Switch to react-navigation in expo2 (#287)

* WIP Switch to react-navigation

* WIP Switch to react-navigation 2

* WIP Switch to react-navigation 3

* Convert all screens to react navigation

* Update BottomBar for react navigation

* Update mobile menu to be react-native drawer

* Fixes to drawer and bottombar

* Factor out some helpers

* Replace the navigation model with react-navigation

* Restructure the shell folder and fix the header positioning

* Restore the error boundary

* Fix tsc

* Implement not-found page

* Remove react-native-gesture-handler (no longer used)

* Handle notifee card presses

* Handle all navigations from the state layer

* Fix drawer behaviors

* Fix two linking issues

* Switch to our react-native-progress fork to fix an svg rendering issue

* Get Web working with react-navigation

* Refactor routes and navigation for a bit more clarity

* Remove dead code

* Rework Web shell to left/right nav to make this easier

* Fix ViewHeader for desktop web

* Hide profileheader back btn on desktop web

* Move the compose button to the left nav

* Implement reply prompt in threads for desktop web

* Composer refactors

* Factor out all platform-specific text input behaviors from the composer

* Small fix

* Update the web build to use tiptap for the composer

* Tune up the mention autocomplete dropdown

* Simplify the default avatar and banner

* Fixes to link cards in web composer

* Fix dropdowns on web

* Tweak load latest on desktop

* Add web beta message and feedback link

* Fix up links in desktop web

src/view/shell/desktop/RightNav.tsx

@@ -0,0 +1,46 @@
+import React from 'react'
+import {observer} from 'mobx-react-lite'
+import {StyleSheet, View} from 'react-native'
+import {usePalette} from 'lib/hooks/usePalette'
+import {DesktopSearch} from './Search'
+import {Text} from 'view/com/util/text/Text'
+import {TextLink} from 'view/com/util/Link'
+import {FEEDBACK_FORM_URL} from 'lib/constants'
+
+export const DesktopRightNav = observer(function DesktopRightNav() {
+  const pal = usePalette('default')
+  return (
+    <View style={[styles.rightNav, pal.view]}>
+      <DesktopSearch />
+      <View style={styles.message}>
+        <Text type="md" style={[pal.textLight, styles.messageLine]}>
+          Welcome to Bluesky! This is a beta application that's still in
+          development.
+        </Text>
+        <TextLink
+          type="md"
+          style={pal.link}
+          href={FEEDBACK_FORM_URL}
+          text="Send feedback"
+        />
+      </View>
+    </View>
+  )
+})
+
+const styles = StyleSheet.create({
+  rightNav: {
+    position: 'absolute',
+    top: 20,
+    left: 'calc(50vw + 330px)',
+    width: 300,
+  },
+
+  message: {
+    marginTop: 20,
+    paddingHorizontal: 10,
+  },
+  messageLine: {
+    marginBottom: 10,
+  },
+})