[core] Remove dangerfile

[michaldudak]

Replaced custom danger-based site deployment notifications with the one coming from Netlify for better DX.

Before:

After:

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[oliviertassinari]

Replaced custom danger-based site deployment notifications with the one coming from Netlify for better DX.

I'm not following, what's the advantage? This looks like the DX regressed here. The problems with this approach:

• Now we can't implement [docs-infra] List danger URL docs preview based on git diff mui-public#260.
• Now it takes more vertical space to scroll.
• Now contributors will have to silence two bot spammy notifications (Netlify + Danger). We need the danger notifications for [core] Add test_bundle_size_monitor back #201. And hopefully, we can implement performance regression tests too.

I have preventively removed the Netlify comment, assuming the case is convincing and we will take the step backward. But maybe I'm missing something, and the points I listed aren't less of a pain than the reason behind this change.