HTTP script rework!

* Update runscript to include EXPRESS_STATIC so that files in /assets are served statically to /
* Update _dorfbot.http script to use mustache template and engine via express
* Cleaned up _dorfbot.http in light of these changes
* Added `mustache` and `consolidate` dependencies. `consolidate` lets express render mustache templates
* Moved main css to its own stylesheet
* Set up views folder with index.mustache
* Spruced up the index page a bit
* Restructured assets folder a bit
* Added a nifty dorfbotish font