Fix PNPM mono repo setup

[kmcginnes]

Description

Moves all repo related activities to the root folder.

Before, you had to open VS Code in the /packages/graph-explorer folder, or the /packages/graph-explorer-proxy-server folder. If you needed both you just had to jump around in different windows. If you tried to open the root folder in VS Code then Prettier & ESLint would not work. Also, managing dependencies was confusing because there were PNPM lock files in the root and each package folder.

Validation

• Open VS Code at the root and ensure Prettier and ESLint work
• Run pnpm start for development
• Read through documentation changes
• Open a test file and run Jest Current File task
• Run docker build . to ensure Docker build succeeds

Related Issues

Addresses #303

Check List

• [x] I confirm that my contribution is made under the terms of the Apache 2.0 license.
• [x] I have run pnpm run checks to ensure code compiles and meets standards.
• [x] I have run pnpm run test to check if all tests are passing.
• [ ] I've covered new added functionality with unit tests if necessary.

[kmcginnes]

Updating to Node v20 is the next step. This will align our requirement to use CorePack, which requires at least v18. But it is a bigger change requiring testing of the Docker containers and Notebooks.

[kmcginnes]

Updated to include the fix from #306 and update it to the newer PNPM version

[kmcginnes]

Updated

• Removed the Node version change since that is the focus of the next PR
• Updated pnpm checks to be better and faster using PNPM's concurrent commands support
• Add /.github/**/** to .prettierignore since there was a warning that we can fix in a follow up PR since this PR is so large already.