content(resources): clean up placeholder resources

src/content/resources/javascript/callbacks/intro.md

@@ -1,10 +0,0 @@
----
-authors:
-  - "Xetera#0001"
-created_at: 2019/07/27
-title: Callbacks
----
-
-## Callbacks are everywhere
-
-If you've been doing javascript for any amount of time you'll have noticed that callbacks appear in just about every single piece of code.

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

@@ -101,7 +101,3 @@ getCharacters().then(characters => {
   console.log(characters); // (20) [{...}, {...}, {...}]
 });
 ```
-
-Let's break down what's happening in this function
-
-// TODO: finish this

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

@@ -5,8 +5,6 @@ created_at: "2019/07/26"
 title: Simplifying Promises
 ---
 
--- placeholder --
-
 The first naive attempt, using new Promise for something that already returns a promise.
 
 ```js

src/content/resources/python/basics.md

@@ -1,15 +0,0 @@
----
-authors:
-  - "Xetera#0001"
-date: 2019/06/26
-title: Some Python Article
----
-
-## Python
-
-This is a placeholder post
-
-```py
-def test():
-  return "Hello world"
-```