* Create sandbox.config.json specifying port 3000
* Update sandbox.config.json
* Create sandbox.config.json for blog example
* Create sandbox.config.json for multiple authors blog
* added sandbox config to portfolios
* [ci] yarn format
* added sandbox.config.json to more frameworks examples
* [ci] yarn format
Co-authored-by: sarah11918 <sarah11918@users.noreply.github.com>