Detailed post typography changes & media queries 

**Changes Made**

- h1, h2, h3, h4, h5, and h6 are all smaller because they were too damn
big.
- Changed post title size
- Added margin top to h3 because it (h3) looked like the paragraph's
attached-at-birth twin
- Adjusted media queries so there is a distinctive difference between
h2, h3 & h4 on post