Update generated README content to fix markdown linting warnings

Author: alejsdev

src/fastapi_new/new.py

@@ -38,7 +38,7 @@ def _generate_readme(project_name: str) -> str:
 uv run fastapi dev
 ```
 
-Visit [http://localhost:8000](http://localhost:8000)
+Visit <http://localhost:8000>
 
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