New "browse" UI

Also, separated out browse, ?meta, and ?module request handlers.

Fixes #82

modules/utils/getScripts.js

@@ -0,0 +1,42 @@
+// Virtual module id; see rollup.config.js
+// eslint-disable-next-line import/no-unresolved
+import entryManifest from 'entry-manifest';
+
+import { createElement, createScript } from './markup.js';
+
+function getEntryPoint(name, format) {
+  let entryPoints;
+  entryManifest.forEach(manifest => {
+    if (name in manifest) {
+      entryPoints = manifest[name];
+    }
+  });
+
+  if (entryPoints) {
+    return entryPoints.find(e => e.format === format);
+  }
+
+  return null;
+}
+
+function getGlobalScripts(entryPoint, globalURLs) {
+  return entryPoint.globalImports.map(id => {
+    if (process.env.NODE_ENV !== 'production') {
+      if (!globalURLs[id]) {
+        throw new Error('Missing global URL for id "%s"', id);
+      }
+    }
+
+    return createElement('script', { src: globalURLs[id] });
+  });
+}
+
+export default function getScripts(entryName, format, globalURLs) {
+  const entryPoint = getEntryPoint(entryName, format);
+
+  if (!entryPoint) return [];
+
+  return getGlobalScripts(entryPoint, globalURLs).concat(
+    createScript(entryPoint.code)
+  );
+}