aggressively trim more whitespace

[binary1230]

• this page in particular was blooming in page size due to whitespace
• manually trim whitespace on guest page

noticed this page was loading really slow on my phone, but pageload time on server was fine.

the file being sent was 2.0MB and mostly whitespace. adding in the '-' characters more aggressively strips whitespace. not sure if this will help too much but, definitely trims the page a ton.

before(left), after(right):

[binary1230]

merge with https://github.com/magfest/ubersystem/pull/2986

[kitsuta]

Oh wow, we probably just need to start using {% -%} as a standard in our codebase. I had no idea that was a thing. +1!