Add "read more" link to RSS feed

[nate-double-u]

Desired feature or idea: What would you like to see happen?

Consider adding a "read more" link to the blog's RSS feed.

Additional context: anything else you can think about that would be helpful.

RSS Reader view:

[svrnm]

@chalin is this something we can solve here or is this upstream for docsy?

[chalin]

We have a custom RSS layout at the moment, so I'll be implementing it here (first).