Update React tutorial

[aefhm]

SUMMARY

We received some requests for a demo or example with React. We have a minimal example here. Let's test/confirm and then highlight it in our documentation.

Note. I think https://github.com/oasisprotocol/demo-oasisswag is the only demo we have that utilizes React, but unfortunately does not wrap Ethers or other ETH calls.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

ADDITIONAL INFORMATION

[matevz]

FYI the hardhat-boilerplate example used in the Browser chapter is not being maintained by upstream for a while now: https://github.com/NomicFoundation/hardhat-boilerplate

It seems feasible, if we ported https://github.com/oasisprotocol/demo-starter frontend to a modern web3 React stack and se it in the Browser chapter instead. At hackathons, people generally prefer React to other frameworks.

[rube-de]

current readme of the hardhat-boilerplate also misses the building of the sapphire packages since it's in the monorepo.
(see on-chain signer readme)