Add demo and share new URL

[anxolin]

Description

This PR adds a DEMO section for the safe app

The goal is to allow to get a feel of the features of the dapp before you follow the tutorial.

I created a new URL for this demo app in here https://safe.widget.cow.fi/

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Apr 11, 2024 0:30am

[elena-zh]

Hey @anxolin , https://safe.widget.cow.fi/ is not working inside the Safe :(

[anxolin]

@elena-zh hahaha, I see why it worked for me but not for you

It's pointing to my local development!

Fix its on its way

[elena-zh]

@anxolin , is working now, thank you!

[anxolin]

@elena-zh I fixed the issue. However, I left the app pointing to production. So until the release is done, it won't work the theming, sounds, etc.