pkg/mods/epm: Add sourcehut to default domain list

vscode: Bump dependency versions.

.cirrus.yml: Bump FreeBSD image version.

Bump staticcheck version in CI config and doc

website/slides: Tweak template, and add FOSDEM slides

pkg/glob: Simplify test with filepath.ToSlash

website: Fix typos

pkg/eval: Refactor the argument parsing logic of randint.

Add test mixing large/small args in randint

Fix type casting with mixed arguments in randint

flake.nix: Document how to update gomod2nix.toml.

.gitignore: Add /result, used by nix

Bump nixpkgs edition, Go compiler version, and update gomod2nix.toml.

CI configs: add nix flake

vscode: Add more support for editing elvts files.