Leadership calendar PDF

Still needs style tweaks to the PDF but figured I can tackle that next sprint.
Also this needs the following ENV vars set:

```
PDF_URL_RULE_1=/the-bureau/leadership-calendar/pdf/
PDF_RENDER_URL_1=DEMO-DOMAIN/the-bureau/leadership-calendar/print/
```
Yeah, what you added is perfect. In the old one (and all over other JSON files) there are spaces before colons, too.

But again, don't worry about it, we'll do a JSON formatting audit later :) I'm going to see if there's a Grunt plugin for doing it automatically, too.