* Adding start_elasticsearch.sh script to run elastic search on the host
in a docker container at http://localhost:9200
* update readme in instructions on how to use script
As per [their blog post of the 27th April](https://blog.readthedocs.com/securing-subdomains/) ‘Securing subdomains’:
> Starting today, Read the Docs will start hosting projects from subdomains on the domain readthedocs.io, instead of on readthedocs.org. This change addresses some security concerns around site cookies while hosting user generated data on the same domain as our dashboard.
Nick Lang