Extract tags partial
	new file:   _includes/tags.html
	modified:   _layouts/post.html
	modified:   blog/index.html
  Note that the we now need to pass in the tags array into the
  partials.
Revert "Extract tags partial"

This reverts commit 72ad1dbcc7830201c317bb5fa9b2e1a1ba7a2d56.

Worked on my machine. Failed when deployed!
Added blogpost about only one speaker per talk