replace human panic email contact method with Discord link

[naturallymitchell]

since #133 went well and I don't like email, let's make this better

[dariusc93]

So you want the discord link in place of the email or do you want the link to be listed in the panic along with the email?

[naturallymitchell]

Contact methods should include:

• Create an issue
  https://github.com/foundpatterns/torchbear/issues/new ... https://github.com/sindresorhus/new-github-issue-url#usage
  title="Panic log message"
  body='panic.message'
• and discord link

[naturallymitchell]

further described in rust-cli/human-panic#7 (comment)

[naturallymitchell]

https://github.com/rust-clique/human-panic/blob/master/src/lib.rs#L162-L173

[naturallymitchell]

I think instead of forking it, which sucks because then we have to push that to crates.io, or fixing it upstream, we can use this https://doc.rust-lang.org/cargo/reference/manifest.html#the-patch-section

[dariusc93]

Relates to 8342368