updated docs

app/readme.md

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+# Application Code
+
+`app/` contains the browser code that gets bundled into `app.[hash].js`. It's got all the logic, crypto, and UI. All of it gets used in the browser, and some of it by the server for server side rendering.
+
+The main entrypoint for the browser is [main.js](./main.js) and on the server [routes/index.js](./routes/index.js) gets imported by [/server/routes/pages.js](../server/routes/pages.js)
+
+- `pages` contains display logic an markup for pages
+- `routes` contains route definitions and logic
+- `templates` contains ui elements smaller than pages