Delete old js and cpp code after repo move.

Current development happens at
git clone https://gerrit.wikimedia.org/r/p/mediawiki/services/parsoid
or (with gerrit auth)
git clone ssh://USERNAME@gerrit.wikimedia.org:29418/mediawiki/services/parsoid

The deployment / packaging repository is at
git clone https://gerrit.wikimedia.org/r/p/mediawiki/services/parsoid/deploy
or (with gerrit auth)
git clone ssh://USERNAME@gerrit.wikimedia.org:29418/mediawiki/services/parsoid/deploy
It includes node_modules and the first repository as a submodule, so you
should do 'git submodule init; git submodule update' to fetch that too.

For more background, see https://www.mediawiki.org/wiki/Parsoid/Setup and
https://www.mediawiki.org/wiki/Parsoid/Packaging.

Change-Id: I502953717696d67ca5c61af982aab65502bc76dd