Front-end article rendering didn't work. Fixed it by removing obsolete article controller (it extended FOF in stead of F0F)

See https://github.com/akeeba/docimport/commit/5e8a562ed443bcfaa5ff8ef0e543fa2f6e7b66b0
Merge pull request #9 from jurianeven/fix/articlecontroller

Front-end article rendering didn't work. Fixed it by removing obsolete a...