installation.md: add bun

[starsep]

• I have followed (at least) the PR section of the contributing guide.

[oliviertassinari]

I doubt we should add this because similarweb shows that node has x10 more traffic on its docs than bun. It suggests that it's not worth the maintenance overhead.

If we replace the markdown code blocks for an abstraction, then it would solve this problem.

[starsep]

Maintaintence doesn't seem too big of a hassle here. But that's a valid concern.

How does yarn/pnpm compare to bun?

[oliviertassinari]

An example of the kind of overhead I'm talking about #42712. mui/mui-public#181 gives some pointers on the data for adoption.

[samuelsycamore]

This is a duplicate of #38460

Seconding @oliviertassinari's feedback, I'd prefer not to add yet another set of package manager installation instructions mostly because it requires maintaining a surprising number of pages, but also because there comes a point at which we're just presenting so many different choices to the user that it becomes overwhelming.

As @ZeeshanTamboli mentioned in the PR linked above, maybe we should consider opening an issue to gauge the community's interest in/need for this.