Don't wrap links with git.io

[samueldr]

As asked:

• https://logs.nix.samueldr.com/nixos/2021-01-01#4421918;
• https://logs.nix.samueldr.com/nixos/2021-01-01#1609531792-1609532209;

Comments?

This will remove the (somewhat) unneeded indirection, at the cost of bulking-up the appearance of the messages with long links.

EDIT: There are links to commits and PRs. These are only the events from GitHub.

[andir]

We can always use nixpkgs.dev/issues/ etc.. no?
I don't know if the bot also does link to specific commits or just issues and PRs.

[andir]

Oh, apparently it stopped working.. @zimbatm did you discontinue nixpkgs.dev?

[samueldr]

This is used for more than Nixpkgs outright. It's for the whole org, plus I recall it might be in use in non-NixOS channels.

[zimbatm]

@andir the right domain is nixpkgs.org