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/
```
Oh geez, a PDFreactor newbie. Who let this guy in? :point_left: 

Yeah it's not needed for PDFreactor. I wonder though if we would need it for non PDFreactor pages. Although the JS might not work when embedded in the xhtml() CSS thingy. Maybe we should just use the PNG?