Consider using web::block in actix when handoutifying

[NilsIrl]

https://actix.rs/actix-web/actix_web/web/fn.block.html

Reasons not to do:

• May reduce performance when no concurrency is needed?
• Handoutify is run on a 1 vCPU VM so only 1 worker is being used which means this may not actually cause anything to be unblocked