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

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

@@ -0,0 +1,24 @@
+export function CreateBackground() {
+  const bkCheck = document.getElementsByClassName("bg");
+  if (bkCheck.length !== 0) {
+    return;
+  }
+
+  // Creating and inserting 3 divs containing the background applied to the pages
+  const container = document.getElementById("container");
+  const menu = document.getElementById("menu");
+  
+  if (!container || !menu) return;
+
+  const backgrounds = [
+    { classes: ["bg"] },
+    { classes: ["bg", "bg2"] },
+    { classes: ["bg", "bg3"] }
+  ];
+
+  backgrounds.forEach(({ classes }) => {
+    const bk = document.createElement("div");
+    classes.forEach(cls => bk.classList.add(cls));
+    container.insertBefore(bk, menu);
+  });
+}