Add yarn.js to .prettierignore

Author: cknitt

.prettierignore

@@ -42,4 +42,6 @@ public/llms/react/**/llm*.txt
 pages/docs/**/**/llms.mdx
 
 # prettier refuses to not mess up the installation table
-markdown-pages/docs/manual/installation.mdx
+markdown-pages/docs/manual/installation.mdx
+
+.yarn/releases/yarn-4.12.0.cjs