React Native accessibility (#539)

* React Native accessibility

* First round of changes

* Latest update

* Checkpoint

* Wrap up

* Lint

* Remove unhelpful image hints

* Fix navigation

* Fix rebase and lint

* Mitigate an known issue with the password entry in login

* Fix composer dismiss

* Remove focus on input elements for web

* Remove i and npm

* pls work

* Remove stray declaration

* Regenerate yarn.lock

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/composer/ExternalEmbed.tsx

@@ -60,7 +60,13 @@ export const ExternalEmbed = ({
           </Text>
         )}
       </View>
-      <TouchableOpacity style={styles.removeBtn} onPress={onRemove}>
+      <TouchableOpacity
+        style={styles.removeBtn}
+        onPress={onRemove}
+        accessibilityRole="button"
+        accessibilityLabel="Remove image preview"
+        accessibilityHint={`Removes default thumbnail from ${link.uri}`}
+        onAccessibilityEscape={onRemove}>
         <FontAwesomeIcon size={18} icon="xmark" style={s.white} />
       </TouchableOpacity>
     </View>