Rails Integration

[joeldrapper]

Opening this issue as a reminder to consider interoperability with Rails partials — i.e. rendering an ERB partial inside a component and making it possible to render Phlex components in ERB templates.

Why?

1. Interoperability with Rails ERB templates might make it easier to migrate a project to Phlex step-by-step.

• [x] Render Rails partials in a Phlex component
• [x] Render Phlex pages from Rails controller
• [x] Rails component helper to render components in Rails views
• [x] #75
• [ ] #57
• [ ] #120