idea: add rss feeds to our slacks

[drmowinckels]

We are getting so many awesome feeds through this repo, and in both the organiser slack and the community slack there are #rladiesblogs (variations on that spelling) where feeds from community member's blog come.

We should add the feeds from here to those slacks! We can either do that manually through the /feed command, or find some other nifty way of doing it.