manifest tweak

src/content/docs/javascript/promises/intro.md

@@ -3,6 +3,7 @@ authors:
   - "@Xetera"
 created_at: 2019/07/26
 updated_at: 2019/07/26
+title: Introduction to Promises
 recommended_reading:
   - javascript/callbacks
   - javascript/es6/arrow-functions

src/content/docs/javascript/simplifying-promises.md

@@ -1,6 +1,7 @@
 ---
-author: "@Xetera"
-date: "2019/07/26"
+authors:
+  - "@Xetera"
+created_at: "2019/07/26"
 ---
 
 # Simplifying Promises