Revert "highlighter"

This reverts commit 145354e93dca8cc0aaecff42d8879de918fd5b68.
Revert "deleted redcarpet"

This reverts commit 9fd9c2e868ad5337acc57223a9762cc37c593bfc.
Revert "removed red carpet"

This reverts commit 663f324b0a73d794e808ebeaa95e1fe2c297e619.
Revert "added red carpet plugin"

This reverts commit a61b9e972fb992dd8920929dfac0b22d328285af.
Revert a911a76..bfad110

This rolls back to commit a911a76a5f8725dda0d2428767914d49863053ce.