index.php
	- in .message-details ul h3 add : after each h3 for separation
Styling home .message-details typography
_typography.scss
	- increase global h1 font-size to 2.9em
	- increase global h3 font-size to 1.8rem from 1.6rem
	- move .message-details specific text align rules to _responsive.scss
_responsive.scss
	- add .message-details text align center rules to mobile media query block
	- set .message-details ul list h3 and p to inline-block (so they're horizontal)
	- remove margins from .message-details h3 and h1
	- add margin-left to li p
Add past messages link on home page and associated styles
Merge branch 'feature-home-design' into develop
- integrate frame, artwork and background into design
- message details typography
- add link to past messages