Remove extraneous whitespace
Add Gemfile containing `github-pages` gem
Remove sample posts
Remove `layout: none` from feed front matter

This was causing Jekyll to error with:

    Build Warning: Layout 'none' requested in feed.xml does not exist.
Remove extraneous whitespace

And end file with a new line.
Remove extraneous whitespace
Remove categories and tags from blog sidebar
Produce RSS feed for blog posts only