Fix OGP.me meta tags - Githubissues

Fix the meta tags describing the individual posts so they appear better on Twitter/FB/etc.

[ ] Use the post title as the main header line when shared
[ ] Add a description of the articles contents that shows up as a subheader when shared
[ ] Add an image that can be used when sharing to social media (single one for the site? article specific image?)

JeffreyHyer / nookandcrannydigest