fix: update module path from gitlab to git.unbound.se

Change the module path in various files to reflect the new 
repository location on git.unbound.se. Update imports in 
CLAUDE.md, error_test.go, and presenter_test.go to ensure 
compatibility with the updated module path. Remove outdated 
CI configuration in .pre-commit-config.yaml to streamline 
the setup. This enhances consistency and aligns the project 
with its new hosting platform.

presenter_test.go

@@ -11,7 +11,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/vektah/gqlparser/v2/gqlerror"
 
-	"gitlab.com/unboundsoftware/shiny/presenter"
+	"git.unbound.se/shiny/presenter"
 )
 
 func Test_globalErrorPresenter(t *testing.T) {