Add alternate template - neat

From https://github.com/BYK/pelican-neat
Fix some styling issues with neat
I don't need Disqus or a share button, or a floating header
Remove a couple of weird bits of styling
Cleaning up about page
More tweaks to the neat style
Don't show sitename in the archive header (it's right above it)
Don't bother with authors, I'm the only author on my site
Whitespace tidy
Add a template for pages
Keep my email private
Fix broken URL
Add affiliate link
Better navigation
Add a brief bio, which allows me to use SITEURL
Switch to pelican-neat