flake: Fix a broken dev shell

[ttrssreal]

The current flake's devShell tries to import Ladybird which was renamed to UI.

Additionally, many dependencies aren't currently included in the devShell. As ladybird is already packaged downstream, we can pull in those buildInputs along with the extra dev dependencies already defined.
This gets the shell working and ladybird buildable :3

[ADKaster]

Thanks for patching the nix shell!

Does this fully resolve this issue then? #371 (comment)

If it does, then a documentation PR to say that the nix build is no longer completely borked would be a good follow-up https://github.com/LadybirdBrowser/ladybird/blob/master/Documentation/BuildInstructionsLadybird.md#nixos-or-with-nix

[ttrssreal]

Hi! You can enter the shell and do a normal cmake build and it seems to work fine. Using vcpkg via ./Meta/ladybird.sh run ladybird will fail when bootstrapping but that's expected.

So then there's just removing the Note, changing Ladybird to UI, and telling people to use cmake?

[timschumi]

Looks like vcpkg bootstrapping is still borked, but reading the comments that seems to be expected.

Updating the documentation surrounding the Nix build would be great, since I currently have no idea on how to test this.

[ttrssreal]

Okie sounds good, you should be able to run nix develop and then cmake build like normal cmake -GNinja -BBuild.

[timschumi]

Ok, looks good to me once we get the documentation in order.

[ttrssreal]

yay :3, do we close #371 then?