renaming, as it does not rely on CGI anymore

Makefile.am

@@ -7,7 +7,7 @@ TEST_LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) \
 TESTS = \
 	t/01compile.t \
 	t/02critic.t \
-	t/cgi.t \
+	t/app.t \
 	t/cli.t \
 	t/metadata.t \
 	t/tools.t