refact(docs-app): move filtered API list into a directive

Each API index page now displays data from an `api-list.json` file found
locally to that page. This lets us have different API lists for TS, JS
and Dart.

tools/api-builder/angular.io-package/index.js

@@ -99,9 +99,9 @@ module.exports = new Package('angular.io', [basePackage, targetPackage, cheatshe
   });
 
   computePathsProcessor.pathTemplates.push({
-    docTypes: ['json-data'],
-    pathTemplate: path.resolve(PUBLIC_PATH, 'resources/js/${id}'),
-    outputPathTemplate: '${path}.json'
+    docTypes: ['api-list-data'],
+    pathTemplate: 'api-list.json',
+    outputPathTemplate: '${path}'
   });
 
   computePathsProcessor.pathTemplates.push({

tools/api-builder/angular.io-package/processors/addJadeDataDocsProcessor.js

@@ -28,9 +28,9 @@ module.exports = function addJadeDataDocsProcessor() {
       var modules = [];
 
       var appDataDoc = {
-        id: 'app-data',
-        aliases: ['app-data'],
-        docType: 'json-data',
+        id: 'api-list-data',
+        aliases: ['api-list-data'],
+        docType: 'api-list-data',
         data: {}
       };
       extraDocs.push(appDataDoc);