Add mermaid

Author: angristan

docusaurus.config.js

@@ -38,6 +38,7 @@ const config = {
           // Remove this to remove the "edit this page" links.
           editUrl:
             "https://github.com/tereus-project/tereus-docs/tree/main/packages/create-docusaurus/templates/shared/",
+          remarkPlugins: [require("mdx-mermaid")],
         },
         blog: {
           showReadingTime: true,