Give explicit names to MobX observer components (#1413)

* Consider observer(...) as components

* Add display names to MobX observers

* Temporarily suppress nested components

* Suppress new false positives for react/prop-types

.eslintrc.js

@@ -26,4 +26,7 @@ module.exports = {
     '*.html',
     'bskyweb',
   ],
+  settings: {
+    componentWrapperFunctions: ['observer'],
+  },
 }