update docusaurus (#567)

* update docusaurus and Add .nvmrc to specify Node.js 20 for Cloudflare Pages

Author: petercrocker

.nvmrc

@@ -0,0 +1 @@
+20

docs/docusaurus.config.ts

@@ -18,7 +18,6 @@ const config: Config = {
   organizationName: 'opsmill',
   projectName: 'infrahub-sdk-python',
   onBrokenLinks: 'throw',
-  onBrokenMarkdownLinks: 'warn',
   onDuplicateRoutes: "throw",
   // Even if you don't use internationalization, you can use this field to set
   // useful metadata like html lang. For example, if your site is Chinese, you
@@ -123,6 +122,9 @@ const config: Config = {
       });
       return transformedContent;
     },
+    hooks: {
+      onBrokenMarkdownLinks: 'warn',
+    },
   },
 };