Remove everything specific to a Gitea deployment (closes #209)

Delete the Gitea compose setup, its document, its two scripts and their
make targets. Drop the Core Rule Set exclusions written for Gitea: the
ten query parameters skipped by rules 930120, 932160 and 932260, and the
gitea_flash and redirect_to cookies. The remaining changes are
renumbered, five in all. Documents and tests use neutral examples.

Model: opus-5-5

internal/config/config_test.go

@@ -197,7 +197,7 @@ const (
 // instance is an SWWAF_INSTANCE_NAME that is a valid app name too, and
 // remoteURL an SWWAF_LOG_REMOTE_URL, for the tests that send the lines.
 const (
-	instance  = "fsn1app1/gitea"
+	instance  = "fsn1app1/blog"
 	remoteURL = "syslog+udp://192.0.2.1:514"
 )
 
@@ -650,11 +650,11 @@ func TestInstanceNameAndLoggedHeadersAsSet(t *testing.T) {
 	t.Parallel()
 
 	cfg := fromEnvironment(t, environment{
-		instanceName:      "fsn1app1/gitea",
+		instanceName:      "fsn1app1/blog",
 		logRequestHeaders: " Accept , X-Custom",
 	})
 
-	if cfg.InstanceName != "fsn1app1/gitea" ||
+	if cfg.InstanceName != "fsn1app1/blog" ||
 		!slices.Equal(cfg.LogRequestHeaders, []string{"accept", "x-custom"}) {
 		t.Errorf("%s is %q and %s gives %v", instanceName, cfg.InstanceName,
 			logRequestHeaders, cfg.LogRequestHeaders)
@@ -797,7 +797,7 @@ func TestInstanceNameNotAnAppNameStopsTheStartOnlyWhileSending(t *testing.T) {
 
 	want := logRemoteAppName + `: is unset, and ` + instanceName +
 		` "fsn1 app1", its default, is not 1 to 48 printable ASCII characters ` +
-		`without a space, such as gitea`
+		`without a space, such as blog`
 	if err == nil || err.Error() != want {
 		t.Errorf("error %v, want %s", err, want)
 	}
@@ -826,7 +826,7 @@ func TestAppNameSetStopsTheStartWhileSending(t *testing.T) {
 	}.lookupEnv)
 
 	want := logRemoteAppName + `: "my app" is not 1 to 48 printable ASCII ` +
-		`characters without a space, such as gitea`
+		`characters without a space, such as blog`
 	if err == nil || err.Error() != want {
 		t.Errorf("error %v, want %s", err, want)
 	}
@@ -2166,7 +2166,7 @@ func TestSettingFromFileIsCheckedAsTheSettingItself(t *testing.T) {
 	}.lookupEnv)
 
 	want = logRemoteAppName + `: "my app" is not 1 to 48 printable ASCII ` +
-		`characters without a space, such as gitea`
+		`characters without a space, such as blog`
 	if err == nil || err.Error() != want {
 		t.Errorf("error %v, want %s", err, want)
 	}