doc: Improves instructions in README

README.md

@@ -7,4 +7,11 @@ Source code for the hillhacks website.
 You need to have [Jekyll](http://jekyllrb.com/) installed.  Follow its
 installation instructions for your platform.
 
-Compile the site with ``jekyll b``.
+Compile the site with ``jekyll b``. You can have a server running 
+using `jekyll serve [--watch] [[--incremental]` with the optional
+`--watch` flag to automatically regenerate the site on file saves
+and the `--incremental` flag to only generate what is needed.
+
+The site uses [kramdown](https://kramdown.gettalong.org/syntax.html)
+and [Jekyll](https://jekyllrb.com/docs/templates/) for syntax
+and templating.