📝🐛 fix schema link

The original domain (`mermaid-js.github.io`) only redirects to the new domain (`mermaid.js.org`) from the root `/`. I've updated the link to point to the new domain directly.

packages/mermaid/src/schemas/config.schema.yaml

@@ -23,7 +23,7 @@
 # - If adding a new object to `MermaidConfig` (e.g. a new diagram type),
 #   you may need to add it to `.vite/jsonSchemaPlugin.ts` and `src/docs.mts`
 #   to get the docs/default values to generate properly.
-$id: https://mermaid-js.github.io/schemas/config.schema.json
+$id: https://mermaid.js.org/schemas/config.schema.json
 $schema: https://json-schema.org/draft/2019-09/schema
 title: Mermaid Config
 type: object