Add a web demo

[tusharsadhwani]

If the app compiles for web with no issues, a web demo on github pages would be pretty neat

here's the simple plug-n-play github action i made for it: Source

PS. adding the deployment key required for the action can be referred from this guide

[justinmc]

Sorry I missed this issue for so long, this is a great idea. I usually try to manually set up a github pages demo for projects like this, but I wasn't even aware of Github's ability to automatically deploy that. I followed your instructions and it seems to work great. Thanks again for this. https://justinmc.github.io/flutter-go/