Server can be run locally on port 4000 by running:
bundle exec jekyll serveWhile the server is running, saving changes in any of the source directories will automatically recompile _site. On that note, don't edit anything directly in the _site directory. It is the compiled static site, and will be overwritten.
Blog posts in the _posts directory must follow the same naming scheme. The urls are generated from the file name.
CSS/SASS should be added to the _sass directory. css/main.scss' imports those files and they are compiled into _site`.