Removed dependency on pico-check and existing tests.
Added jest as dev dependency, introduced minimal configuration for it.
Added a very first couple of tests for our markdown parser/renderer.
* Enable caching of static assets
* Remove dependency on mime package
Since we only care about two file extensions at the moment,
there is no need to grab the whole package just to avoid
calling 'endsWith' twice.
Added circleci build badge.
Added contribution section.
Refactored the source to fit (mostly) into
80-column limit so it can be nicely read in
terminal applications
Alexey Sachkov