Allow to delete contests

app/views/application/_modal.html.slim

@@ -0,0 +1,18 @@
+.modal id="#{modal_id}" tabindex=-1 style="position:fixed; background-color: rgba(0, 0, 0, 0.5)"
+  .modal-dialog.modal-dialog-centered
+    .modal-content style="background-color: white;width: 100%"
+      .modal-header
+        .modal-title
+          = modal_title
+        button.btn-close type="button" id="#{modal_id}_close"
+      .modal-body
+        = modal_text
+      .modal-footer
+        = link_to t("helpers.buttons.confirm"), path, data: { turbo_method: :delete }, class: "btn btn-danger"
+javascript:
+  document.getElementById("#{modal_id}_close").addEventListener('click', (e) => {
+    document.getElementById("#{modal_id}").style.display = "none";
+  })
+  document.getElementById("#{modal_id}_button").addEventListener('click', (e) => {
+    document.getElementById("#{modal_id}").style.display = "block";
+  })