Add .puzzle to puzzle partial

<ove .text-center from play page to puzzle partial
Remove padding-top from jumbotron
Move color from h1 to .jumbotron
Resize gallows and puzzle columns

Increase puzzle font-size to fill real estate
Remove gallows outline

Increase gallows base width
Add body parts to gallows partial
Update session cookie name
Remove .head from sass assets

Not ready for it yet
Remove static behind jumbotron
Format home page

Add email link
Add source code link
Add tip link (no link yet)