Add starter-mastro

[mb21]

Added packages/starter-mastro/ with what pnpm create @mastrojs/mastro adds.

I changed only two things:

• removed the .gitignore (because the other packages don't have it either)
• in starter-mastro/package.json, the key apparently needs to be called "build", otherwise pnpm run run:build starter-mastro doesn't pick it up, even though it's correct in the root package.json.

I'm mostly curious to see the numbers myself. Would be great to have this benchmark for the further development of Mastro. But perhaps it's good to have a framework that doesn't use a bundler out of the box in the list as well, just to make sure things work for that use-case as well? I'd be happy to help maintaining this folder.

[AlexanderKaran]

@mb21 Super exciting, just one little change needed (see comment)

Super excited about this, I will get it merged and watch the stats run to make sure it runs correctly.

[mb21]

@AlexanderKaran cool, that's awesome! 🚀

I pushed two commits: running the formatter and adding the flag. Feel free to squash and merge them.

[mb21]

Thanks for getting this through so quickly!

Let me know if/when I should change anything for Mastro to show up in pnpm dev:docs and to do the SSR measurement. Perhaps you first want to refine the CONTRIBUTING.md a bit more and then I can use that to proof read it and see whether it makes sense to somebody not that familiar with the project yet?