cleaned files by prefixing names with 'example' when not means to be used in other plugins aka not utils

plugins/wp_model_plugin/js/example_init.js

@@ -0,0 +1,8 @@
+
+const title = document.querySelector(".first_el_to_change");
+title.innerHTML = "--- coucou ;) " + myvar_1;
+
+const ajax_button_1 = document.querySelector("#test_ajax_1");
+ajax_button_1.addEventListener('click', () => {
+	ajax_post(ajax_button_1, 'get_data');
+});