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/
```
I like where you're going but I don't think `screen` and `print` properly convey what they are. One simply ditches the header and footer. Maybe `wrapper` and `basic`? `wrapper`, `no-wrapper`?