feat: list testnet faucets

[peetzweg]

Closes #460

Added an md file with a list of recent testnet faucets and reference it in these error messages.

This error message is a bit hard to get, it's only visible if you have a valid wallet extension but not created an account yet. I think we should add it somewhere else as well. See below:

How about we add a list of useful links, like to the faucet md file, right here:

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[statictype]

How about we add a list of useful links...

How about we link to it in the "Help & Feedback" modal?

[peetzweg]

How about we link to it in the "Help & Feedback" modal?

Yes for sure the simplest solution. Just added it. Not as visible but can't hurt imho.

Regarding the link to the faucet in the <Statistics/> component. I think it should be a link to the faucet directly instead of the link to the FAUCETS.md file. Let me know if we want to add this or if the link in the help modal is good all we want. :)

https://github.com/paritytech/contracts-ui/blob/66a276e314ee5c2da85277b7a3eaed7a9667f9aa/src/ui/components/homepage/Statistics.tsx#L36-L41

[statictype]

I think the modal is good for now. We could also link to the new page in the project README.

[peetzweg]

Good points! Adapted the icon and added a reference to it in the README file.

[statictype]

please resolve conflicts so we can merge this!

[peetzweg]

please resolve conflicts so we can merge this!

@statictype done, please reapprove. 👍

Btw do we know now whats wrong with the cypress test in ci? Locally they run just fine.