feat: improve apis + add animated background and assessment average plugins

src/plugins/built-in/animatedBackground/utils/RemoveBackground.ts

@@ -0,0 +1,6 @@
+export function RemoveBackground() {
+  const backgrounds = document.getElementsByClassName("bg");
+  
+  // Convert HTMLCollection to Array and remove each element
+  Array.from(backgrounds).forEach(element => element.remove());
+}