Add repository field to package.jsons

[leeyi45]

When I was trying to write my own implementations for conductor, I found all these mysterious packages lying around the frontend. I had no idea where they were from or where they were hosted, and so it took some sleuthing around to find this repository.

If we include the repository field in each package's package.json it will be infinitely easier to find where each package's source code lives.

Also change to use yarn constraints to help enforce this

[gemini-code-assist]

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The package or glob expression "@sourceacademy/web-stepper" is specified in the `ignore` option but it is not found in the project. You may have misspelled the package name or provided an invalid glob expression. Note that glob expressions must be defined according to https://www.npmjs.com/package/micromatch
The package or glob expression "@sourceacademy/web-data-visualizer" is specified in the `ignore` option but it is not found in the project. You may have misspelled the package name or provided an invalid glob expression. Note that glob expressions must be defined according to https://www.npmjs.com/package/micromatch