Fix validation errors

Conflicts:
	_layouts/default.html
Use SCSS
Start refactoring the styles with SCSS
Remove smooth scrolling to speed up page loads
Remove the Makefile

There's no more JavaScript in the repo, and unfortunately the empty
YAML front matter block breaks linters, so this isn't necessary
anymore.
Merge branch 'redesign' into gh-pages

Conflicts:
	_layouts/default.html