Uniformize folder structure (#693)

* Uniformize folder structure

* Fix icons

* Fix icons

* Fix tests

* Fix tests

front/src/hooks/useFirstMountState.ts

@@ -0,0 +1,13 @@
+import { useRef } from 'react';
+
+export function useFirstMountState(): boolean {
+  const isFirst = useRef(true);
+
+  if (isFirst.current) {
+    isFirst.current = false;
+
+    return true;
+  }
+
+  return isFirst.current;
+}