change module path from git.eeqj.de/sneak/neoirc to sneak.berlin/go/neoirc

Update go.mod module directive, all Go import paths, and JSON schema
$id URIs to use the new sneak.berlin/go/neoirc module path.

pkg/irc/numerics_test.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"testing"
 
-	"git.eeqj.de/sneak/neoirc/pkg/irc"
+	"sneak.berlin/go/neoirc/pkg/irc"
 )
 
 func TestName(t *testing.T) {