Move examples to snarkyjs repo and pull from there instead of zkapp-cli

[mitschabaude]

trafficstars

We should be able to construct a URL for getting snarkyjs at the git tag that corresponds to the npm version number in the template that zkapp-cli pulls from github:o1-labs/zkapp-cli#main. That would give us examples which should definitely work with that snarkyjs version

TBD: What's the value of pulling the examples from a URL? If the idea is that an old zkapp cli can still create up to date project templates -- which is awesome! -- then in commands like zk deploy we should only use the snarkyjs from the user's directory, not one from the installed zkapp-cli, otherwise we'll be incompatible.

We only have to keep the deploy API of snarkyjs stable, so that an old zkapp-cli still does the right thing.

[jasongitmail]

If the idea is that an old zkapp cli can still create up to date project templates -- which is awesome! ...

Yep! That's the reason for fetching project templates. They'll always be the latest, unless the dev is offline, then a cached version is used.

And for the example source files, the reason to fetch those was two fold: 1.) early on, the aspirational intention was for for tutorials to be added/updated at a quick pace and we wanted them to all be available to all devs at all times, and avoid the bad experience of a dev using an older version of the CLI and encountering a "whaaat this example command in the docs doesn't work for me" experience, if we had used local examples. And 2.) to avoid a situation where a dev thinks they have example A, but we actually changed the API and updated example A to something newer on Github.

But at this point, open to changes!

[jasongitmail]

Reviewing with Yoni. We don't think the benefits outweigh the costs and want to close to clean up repo for now