fix(stage-deploy): build main with local bob

[caugner]

1. Fixes the stage-deploy by using mdn-bob as specified in the package.json / yarn.lock.
2. Run the workflow on pushes to main (continuous deployment).
3. Format the workflow file with prettier (npx prettier -w).

Depends on #2388.

[welcome]

💖 Thanks for opening this pull request! 💖
Here is a list of things that will help get it across the finish line:

• If this is a new or updated CSS interactive example, please ensure that you followed the CSS styleguide - If this is a new or updated JavaScript interactive example, please ensure that you followed the JavaScript styleguide - If your changes affects any of the steps in our contribution docs, please also make the relevant changes there.

[caugner]

@NiedziolkaMichal @nschonni Feel free to merge this PR after approving. This will not only fix the stage-deploy workflow, which was broken for months, but also makes sure the interactive-examples on stage are built on every push to main.

Once this works, we can replicate this for prod, except that we would probably want to build prod only once per day.

[NiedziolkaMichal]

This looks good to me, but I am not into GitHub workflows, so it would be great if @nschonni could check it too.

[caugner]

Alternatively, @schalkneethling might be able to have a look next week. 🙏

[nschonni]

I guess this goes from using the live bob to the NPM published version, so i think it looks fine

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[caugner]

Thank you @nschonni! 🙏

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