fix(aio): convert API and content docs to JSON

aio/transforms/angular.io-package/processors/convertToJson.js

@@ -0,0 +1,20 @@
+module.exports = function convertToJsonProcessor() {
+
+  return {
+    $runAfter: ['checkUnbalancedBackTicks'],
+    $runBefore: ['writeFilesProcessor'],
+    docTypes: [],
+    $process: function(docs) {
+      const docTypes = this.docTypes
+      docs.forEach((doc) => {
+        if (docTypes.indexOf(doc.docType) !== -1) {
+          const output = {
+            title: doc.title || doc.name,
+            content: doc.renderedContent
+          };
+          doc.renderedContent = JSON.stringify(output, null, 2);
+        }
+      });
+    }
+  };
+};