Article on scaling changefeeds

[mglukhovsky]

We should add an article detailing patterns and solutions for scaling changefeeds in productions.

One example: using rethinkdb proxy nodes to increase the number of open changefeeds, without actually storing data, allowing you to use proxy nodes as coordinators for large numbers of changefeeds.

[danielmewes]

Also related to https://github.com/rethinkdb/docs/issues/962

[lelandcope]

Has an article been written on how to scale changefeeds? I can't seem to find anything on google :/