Update to use Vite instead of create-react-app

[abigailalexander]

Create-react-app is now deprecated, and came with many vulnerabilities in its dependencies. The recommended tool to use now is vite. I have updated cs-web-lib to use this, as well as:

• Swapped from jest to vitest
• Updated the github actions to use Node 18. This is necessary because create-react-app used polyfills to provide methods like fetch globally, and vite does NOT do the same. However, Node 18 onwards provides fetch globally. We are also currently on Node 21, so 16 is outdated.
• Changed the name of environment variables to match vite conventions. This changes from process.env.REACT_APP_(NAME) to import.metadata.env.VITE_(NAME).
• Minor linting changes

[iamvigneshwars]

There are two EOF and few suggestions in the CI, apart from that LGTM!

[iamvigneshwars]

Since you are updating stuffs, it is also worth setting up a dependabot in the CI. It keeps all the libraries up-to date. It will open a PR for every version upgrade so you dont have to worry about any new breaking changes.

[abigailalexander]

Good idea, although I'll probably do that in a separate PR.