Clean up after PR #121.
Bugfixes: - Fix the "SLSA" link in the upper left corner, which was broken. - Add blank lines around `span` tags to fix Markdown syntax. (This isn't valid HTML, but I'll address that in another PR.) Cleanups: - Remove .DS_Store. - Make links relative so that they work on GitHub. - Re-indent to minimize differences from upstream theme (minima). Signed-off-by: Mark Lodato <firstname.lastname@example.org>