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/
```
No, it just has no connection to the preceding sentence, so I thought it would be nice to separate them visually, since you already set the precedent for multiple paragraphs above.