Tidied HTML

Removed <br> for semantics
Fixed one validation error with extraneous </li>
Typo fix 'availble' -> 'available'
.xcf for GIMP and instructions for how to use
Merge branch 'gimp-support' of https://github.com/zaccolley/weheart.github.io into zaccolley-gimp-support

Conflicts:
	index.html
Merge branch 'zaccolley-gimp-support'