feat: Flat import of markdown repo

This is a flat (without history) import of (some of) the content
from our markdown module.

We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.

Since this contains many images, it would balloon the size of this repo
to import the full history.

Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown

markdown/dev/guides/plugins/using-hooks-more-than-once/en.md

@@ -0,0 +1,26 @@
+---
+title: Using hooks more than once
+order: 80
+---
+
+What if you want to attach more than one method to a hook?
+You could spread them over seperate plugins, but there's a better way.
+
+Rather than assigning a method to your hook, assign an array of methods like this:
+
+```js
+import myCoolMethod from './method-a';
+import myEvenCoolerMethod from './method-b';
+import {name, version} from '../package.json';
+
+export default {
+  name,
+  version,
+  hooks: {
+    preRender: [
+      myCoolMethod,
+      myEvenCoolerMethod
+    ]
+  }
+}
+```