Update file system

Switch from “partials” to “blocks” to enforce BEM. Set up head partials
for each of the larger pieces of the head tag that could contain a lot
of page or content logic.
Add custom logo font
Update Sass file names

Switch from “modules” to “blocks” to enforce BEM.
Update header markup
Update live reload port
Update header styling
Add fixed responsive navigation
Merge branch 'site-header' into review