* Refactor main README
* Update Anserini Dependency docs
* Update idf baseline and Kim CNN docs to use Castor-data
* Update remaining READMEs to reference Castor-data
* Change default path from data to Castor-data
* Fix wrong order of embeddings path
So that any experiments can be controlled from the command line, I've set the defaults to what they were hardcoded (for the seed) and num_threads in kim_cnn to be consistent with the default in sm_cnn.