Guest Book built with JS SDK and ETH Shanghai workshop

[think-in-universe]

We have a lesson talking about NEAR JavaScript SDK this week in our CN NEAR Certified Developer course in May.

• slides of the NCD lesson: Writing Smart Contracts in JavaScript
• simplified slides for ETH Shanghai and the recording

During the lesson, we implemented the Guest Book demo with JS SDK.

• Here is the PR demos how it looks like: https://github.com/near-examples/guest-book/pull/702
• Preview version at: https://think-in-universe.github.io/guest-book/

Please feel free to take a look and share your comments.

There are some caveats that are not easy to notice at the beginning, so it takes some time for us to debug and resolve the issues.

[volovyks]

@think-in-universe reviewed.
You can also use this template project, but it has no front end yet.