jekyll-lastindex
You want your index page to be your latest blog post? Just use this plugin.
Usage
Copy the last_index.rb file into your _plugins folder and you're all set.
It will copy the rendered version of the latest entry in any collection to
<collection_name>/index.html, as well as the latest post to /index.html.
Don't want to generate an index for some collections?
Just add a disable_index: true key to your _config.yml file.
collections:
foobar:
output: true
disable_index: true