docs: Disable emoji rendering (#10994)

# Which Problems Are Solved

We had to wrap reserved scopes like
`urn:zitadel:iam:org:id:178204173316174381` in a code block, because
Docusaurus was rendering 🆔 as emoji.

# How the Problems Are Solved

Update Docusaurus to 3.9.2. and disable the emoji rendering in markdown
files.

# Additional Changes


# Additional Context

Co-authored-by: Florian Forster <[email protected]>

docs/docusaurus.config.js

@@ -470,6 +470,7 @@ module.exports = {
   ],
   markdown: {
     mermaid: true,
+    emoji: false
   },
   themes: [
     "docusaurus-theme-github-codeblock",