Docs changes/ideas

- [`Readme.md`](https://github.com/copy/v86/blob/master/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
- mention https://github.com/chschnell/v86-buildroot
- fix the required Node.JS version: https://github.com/copy/v86#how-to-build-run-and-embed done in d116cf2
- [`docs/archlinux.md`](https://github.com/copy/v86/blob/master/docs/archlinux.md):
- update for newer versions
- shrink the "[Networking](https://github.com/copy/v86/blob/master/docs/archlinux.md#networking)" section, as we have extended info in [`docs/networking.md`](https://github.com/copy/v86/blob/master/docs/networking.md)
- [`docs/linux-9p-image.md`](https://github.com/copy/v86/blob/master/docs/linux-9p-image.md):
- add instructions for other initramfs generators (e. g. dracut)
- [`docs/networking.md`](https://github.com/copy/v86/blob/master/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`](https://github.com/copy/v86/blob/master/docs/windows-9x.md):
- (maybe) remove the "[Floppy disk support](https://github.com/copy/v86/blob/master/docs/windows-9x.md#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- take some notes from #1462 and #1502 outdated
- document "It is now safe to turn off your computer" fix on startup, see https://github.com/copy/v86/discussions/1553#discussioncomment-16853708 done in #1618
- (maybe) document on how to install on v86: https://github.com/copy/v86/discussions/1553#discussioncomment-16893976 done in #1618
- [`docs/windows-nt.md`](https://github.com/copy/v86/blob/master/docs/windows-nt.md):
- https://github.com/copy/v86/discussions/1615 and (maybe) networking
- [`docs/cpu-idling.md`](https://github.com/copy/v86/blob/master/docs/cpu-idling.md):
- move AmnHLT part to `docs/windows-9x.md`, remove as unnecessary: https://github.com/copy/v86/pull/1581#issuecomment-4702163627 done in #1618
- [`tools/docker/README.md`](https://github.com/copy/v86/blob/master/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 done in #1581
- (maybe) document about some virtio devices (for example, https://github.com/copy/v86/pull/949#pullrequestreview-1773429638)
- https://github.com/copy/v86/issues/1444
- (maybe) API docs: https://github.com/copy/v86/issues/100#issuecomment-1374637474 and https://github.com/copy/v86/issues/1518 done in 452df77
- https://github.com/copy/v86/issues/1568 done in #1618