~dricottone/blog

ref: 4edfb14d72c852860c800f7f27cdd48bc8fe630b blog/layouts/partials d---------
Refactor head partial

Switch commented-out resources to conditional resources. Now these CSS
and JS files can be sourced on a per-page basis. Simply set e.g.
`lightbox = true` in the header of a Markdown file.

Removed outdated `navi.css`.

Added helpful comments and reorganized resources by type rather than
source.

Added logic to JS inline script so that the list navigation can be
tabbed through and the focused item will trigger on hitting Enter.