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 https://github.com/copy/v86/discussions/1442 done in https://github.com/copy/v86/pull/1457
• docs/windows-9x.md:
  • (maybe) remove the "Floppy disk support" section (should have been fixed after https://github.com/copy/v86/issues/1362)
  • document https://github.com/copy/v86/issues/1185 and https://github.com/copy/v86/issues/289 done in #1430
  • (maybe) document about SoftGPU or vmdisp9x (https://github.com/copy/v86/issues/697#issuecomment-2676743706) done in #1430
  • take some notes from #1462
• tools/docker/README.md:
  • change debian to alpine (https://github.com/copy/v86/commit/2e5b6e100cd78deaa99a5ee5eaa04e5d1285c4f0)
• 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, https://github.com/copy/v86/pull/949#pullrequestreview-1773429638)
  • https://github.com/copy/v86/issues/1444