Docs changes/ideas

[SuperMaxusa]

• Readme.md:
  • Debian has removed i386 installer and kernel for trixie: https://www.debian.org/releases/trixie/release-notes/issues.html#reduced-support-for-i386
• docs/archlinux.md:
  • update for newer versions
  • shrink the "Networking" section, as we have extended info in docs/networking.md
• docs/linux-9p-image.md:
  • add instructions for other initramfs generators (e. g. dracut)
• docs/networking.md:
  • tell more about guest OS network card support (for example, ReactOS support virtio)
  • mention RootlessRelay #1442 done in mention RootlessRelay in docs #1457
• docs/windows-9x.md:
  • (maybe) remove the "Floppy disk support" section (should have been fixed after Improve Floppy Controller #1362)
  • document Can't boot into Windows 95 (VFBACKUP could no load VFD.VXD). #1185 and Windows 95: Q150164: VFBACKUP Could Not Load VFD.VXD #289 done in docs: update windows-9x.md #1430
  • (maybe) document about SoftGPU or vmdisp9x (MS-DOS prompt freezes Windows 95 #697 (comment)) done in docs: update windows-9x.md #1430
  • take some notes from Windows 95 - Upper limit on disk size #1462
• tools/docker/README.md:
  • change debian to alpine (2e5b6e1)
• others:
  • (maybe) document about DOS (how to set a sound card, networking etc), Windows 3.x and other OSes
  • (maybe) document about some virtio devices (for example, Implement Virt-io Console device. #949 (review))
  • No documentation for splitting disk images into chunks #1444