Add FujoCoded newsletter/link to the site

The website doesn't really showcase that FujoCoded is its "parent" company and... well, it should!

The issue identifies the website as the place for this change but names no file or entry point. Start by locating the site's main navigation or branding area and decide where a FujoCoded newsletter or link belongs; done means the parent-company relationship is visibly represented on the site.

由索引模型根据 Issue 内容生成。