update code block styling for InfluxQL

[jackzampolin]

Originally: https://github.com/influxdb/influxdb.com/issues/193

Currently the sql blocks get SQL styling, which doesn't recognize many InfluxQL tokens. Let's update the parser/highlighter as appropriate so we can show InfluxQL without artifacts from SQL.

[beckettsean]

a good idea but more complexity than we need, probably.