chore(docs): add github fetch example to demo

[runningdeveloper]

Description

Added a fetch example to the demo site. Type github mkrl and it returns Mikhail Korolev has 42 public repos.
If you prefer me to do it with async await I can adjust it.

I'm not sure what to put in the feature list. Maybe something like"Block user input while you do an operation, like fetch data". We could make the clickable command be to your profile or some big org like github mozilla

Based on #13

Pre-review checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if required)
• My contribution is awesome

[mkrl]

Nice! Looks good, but I would say instead of calling stop() in both then and catch, it can be changed to just be called once in finally.

[mkrl]

Nice job! It's a good example of wrapping an async action into user-blocking 'start/stop'.

[github-actions]

🎉 This PR is included in version 1.0.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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