Post on markdown

closes blog-posts#236 (closed)

Markdown Kramdown Tips and Tricks

• Promotes our Markdown Guide - handbook page
• Light technical overview with a very friendly and more personal approach
• Subject suggested by Amara :)

Better if someone reviews first, but it seems good to go.

Checklist:

• Review => Marcia ok, Axil ok, Amara ok, Marcia (last fixes)
• Frontmatter
• Date: Friday, July 15th, 2016 Tuesday, July 19th
• Image compressed by tinypng

cc/ @ashleys @amara @axil