feat: add script to generate default blog cover image

- Introduced a new script `make-blog-cover.mjs` to create a default cover image for blog posts.
- The image is generated in PNG format with dimensions 1200x630, suitable for Open Graph.
- Utilizes the site's branding colors and logo from `public/nobat724.svg`.
- Includes custom font styling using the Vazirmatn font.
- The generated image is saved to `public/assets/images/blog-default-cover.png`.

components/blogs/latestArticles/Article.js

@@ -2,12 +2,10 @@ import CustomLoading from "@/app/component/loading/Custom";
 import TextLoading from "@/app/component/loading/Text";
 import Image from "next/image";
 import Link from "next/link";
-import { convertTimestampToJalali, imageUrl } from "@/helper";
+import { blogCover, convertTimestampToJalali } from "@/helper";
 
 function Article({ data }) {
-  const imageSrc = data.images?.[0]?.url
-    ? imageUrl(data.images[0].url, "/assets/images/cover-blog-1.png")
-    : "/assets/images/cover-blog-1.png";
+  const imageSrc = blogCover(data);
   const createdDate = data.created ? convertTimestampToJalali(data.created) : "";
 
   return (