Add link to Render deployment

[anurag]

Add a link to deployment instructions for Render. I noticed the Heroku instructions actually link to a Django project. I created a Flask guide here which is linked in this PR.

[davidism]

First, cool project and thanks for adding docs for Flask to it.

However, I don't want this to become an ever updating list of people's favorite services, it's meant to give an idea of what's possible, not be comprehensive. I may change this whole section eventually. Not sure if I'll merge this yet, but you'll need to put it at the bottom of the list. Also, rebase it onto 1.0-maintenance.

[anurag]

Makes sense. Will do!

[anurag]

@davidism I rebased onto 1.0-maintenance and changed the base branch as well. Does everything look okay?

[anurag]

In case it helps, and as additional context, Gatsby and Create React App have both added Render as an official deployment options.

[davidism]

At this time I don't plan on adding more services to this list. Thanks for working on it though! I'm planning to refresh the deploy docs in general, and will keep you in mind when considering how I want to add 3rd-party services in the future.