When a mod is disabled, a naïve search for the item will yield an
empty set. Instead, ignore whether a mod is disabled when looking for
the principle item for a given page.
When a visitor arrives at the site for the first time, this will
ensure they have a certain set of mods on/off. Right now, that means
IC2-Classic is off by default, and everything else is on.
* Update build process to *not* copy over prerendered pages during a
regular build (only during a `dist` build)
* Add dependency on npm "markdown" package and include it in the
scripts loaded in the default layout
* Update the Item model to be able to load from a *.cg file
* Add an ItemParser to process the `item.cg` file
* Update the general parser to be able to work with HereDoc-style
text blocks
* Add a markdown-specific stylesheet
* Add a sample of the `item.cg` file format (Advanced Crafting Table)
Andrew Miner