Major update: upgrade to nodejs 18 and pnpm

[bjester]

Hello contributors! In case any of you have open pull requests on Kolibri Studio, I wanted to let you know we've recently merged a major update. Here's a summary of the update:

• node.js was upgraded to v18
• the frontend package manager was transitioned to pnpm instead of yarn
• much of the frontend codebase has been reformatted to align with new linting and prettier rules
• much of the frontend tests have been updated to use newer dependencies appropriately

It is suggested that you:

• remove your node_modules directory
• follow the updated setup guide for the node.js and pnpm update
• rebase any open PRs you may have on the latest unstable
• if you experience errors using yarn after updating your Studio project, you may need to add export SKIP_YARN_COREPACK_CHECK=1 to your terminal environment

If you need assistance rebasing any of your PRs, or making any other changes in accordance with this update, please let me know!

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Team presentation on the updates