Finish dark.ts initial port and restructure files to get ready for build script

Build script currently fails to type check. Not sure whats going on. Will fix in the morning.

Co-authored-by: Nate Butler <nate@zed.dev>

styles/buildStyleTree.ts

@@ -0,0 +1,11 @@
+import dark from "./themes/dark";
+import light from "./themes/light";
+import app from "./styleTree/app";
+
+for (let theme of [dark, light]) {
+    let styleTree = app(theme);
+
+    let styleTreeJson = JSON.stringify(styleTree);
+    console.log(styleTreeJson);
+    // TODO: Write style tree json to zed crate assets folder
+}