Ability to define line height & font size

[mhh99]

This will make it possible to accommodate the design to either A5 or A6 format.

[kychris]

I find one simple way to achieve this is by just editing src/pdf/components/itinerary.jsx yourself.

Search frontSize, height and minHeight on that page, and build the app yourself. I set height to 25 which works pretty well.

[klimeryk]

Similar and related to #48 (comment) - see my comment there. As @kychris mentions, it's possible to adjust it in the code "easily" - but that requires JavaScript knowledge. Of course, long term, I want everyone to be able to adjust these settings themselves. And I'm working on implementing that.