Listing RGBDS in platforms' package managers

By now RGBDS is listed on enough platforms' package managers, with various maintainers and states of updatedness. When packages are well-maintained, whether by us or third parties, it may be appropriate to mention them at https://rgbds.gbdev.io/install.

• Linux:
  • apt (Debian, Ubuntu, Linux Mint, etc): https://packages.debian.org/testing/rgbds, https://packages.debian.org/sid/rgbds, and https://packages.ubuntu.com/resolute/rgbds
    • Maintained by @avivace and @robbi-blechdose (see https://salsa.debian.org/games-team/rgbds)
    • Not yet available in stable releases, but they've prepared everything so it will be
  • dnf (Fedora, RHEL, CentOS, etc): https://packages.fedoraproject.org/pkgs/rgbds/rgbds/
    • Maintained by Benjamin Lowry (blowry)
    • Needs updating from 0.9.0! (see https://bugzilla.redhat.com/show_bug.cgi?id=2343435)
  • pacman (Arch, Manjaro, EndeavourOS, etc): https://archlinux.org/packages/extra/x86_64/rgbds/
    • Maintained by @alucryd
  • portage (Gentoo, ChromeOS, etc): https://gpo.zugaina.org/dev-util/rgbds
    • Maintained by @orbea
  • Flatpak (many):
    • Not yet listed! (see https://docs.flatpak.org/en/latest/building.html)
• Windows:
  • WinGet (first-party):
    • Not yet listed! (see https://learn.microsoft.com/en-us/windows/package-manager/package/)
  • Chocolatey (choco, third-party): https://community.chocolatey.org/packages/rgbds
    • In progress by @Rangi42 (see https://github.com/zemzelett/chocolatey-packages)
    • Needs updating from 0.5.2! (see #1675)
• macOS:
  • Homebrew (brew): https://formulae.brew.sh/formula/rgbds
    • Maintained automatically (see https://github.com/Homebrew/homebrew-core/pulls?q=is%3Apr+rgbds)
  • MacPorts (port):
    • Not yet listed! (see https://guide.macports.org/#project.contributing)
• BSD:
  • pkg (FreeBSD): https://www.freshports.org/devel/rgbds
    • Maintained by @nunotexbsd