remove most general left/right column overrides (css only) These overrides were to match the old RTK theme, which is now unnecessary. This allows the columns to stretch wider to match the wider site width from previous commit.
remove most general left/right column overrides (css only)
These overrides were to match the old RTK theme, which is now
unnecessary. This allows the columns to stretch wider to match the
wider site width from previous commit.

relates to #503

openaustralia/righttoknow,openaustralia/righttoknow,openaustralia/righttoknow