feat: add Haiku to the operating systems section

[rjzak]

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NOTE: Please ensure you've completed each of these items after submitting your pull request:

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[bprestonlf]

@andyjohnstonmoore + @rpsene - Please review proposed listing / category assignment

[rpsene]

@bprestonlf we are good to go. It has support for RISC-V via qemu.

[rjzak]

Haiku also runs on RISC-V hardware (images):

• Unmatched
• Vision Five 2

I'm working on getting a better logo, then I'll mark the PR as ready.

[rjzak]

Why can't Haiku have a link to the Haiku ports repo https://github.com/haikuports/haikuports/? Either with or without the ending slash has the same error. Is it upset about the different organisation name?

FATAL: item Haiku has an invalid repo https://github.com/haikuports/haikuports/

Edit: nevermind, I didn't see the refreshed checks window so I thought it was still upset regardless of the ending slash in the repo URL.
Still working on a better logo, the SVG requirement (and not SVG with embedded data) has been a challenge.

[rjzak]

LGTM