Port of Pixyll CSS and basic theme structure

Imported existing partials and CSS from my work-in-progress website.
There are no archetypes, the homepage looks roughly correct,
but individaul post pages will not look work.
There is no pagination yet.
Contact and about pages do not exist.
There is no 404 override.
The SASS could be consolidated.
Social links are never displayed.
The screenshots do not meet Hugo Themes size standards.
This is just a start.