Restructure folders (#184)

* Split up `video_chat.dart`

* Restructure home folder

* Restructure settings folder

* Restructure channel folder

* More restructuring

lib/screens/channel/video/video.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'package:frosty/screens/channel/video/video_store.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+/// Creates a [WebView] widget that shows a channel's video stream.
+class Video extends StatelessWidget {
+  final VideoStore videoStore;
+
+  const Video({
+    Key? key,
+    required this.videoStore,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return WebView(
+      backgroundColor: Colors.black,
+      initialUrl: videoStore.videoUrl,
+      javascriptMode: JavascriptMode.unrestricted,
+      allowsInlineMediaPlayback: true,
+      initialMediaPlaybackPolicy: AutoMediaPlaybackPolicy.always_allow,
+      onWebViewCreated: (controller) => videoStore.controller = controller,
+      onPageFinished: (string) => videoStore.initVideo(),
+      navigationDelegate: videoStore.handleNavigation,
+      javascriptChannels: videoStore.javascriptChannels,
+    );
+  }
+}