docs: restructure host setup by distro, configuration by compositor

Split the docs' single distro×desktop axis (ubuntu-gnome / ubuntu-kde / fedora-kde) into two,
which deduplicates the shared mechanics and scales to distros that run several desktops (Arch):

- Install the host — per distro/OS (ubuntu, fedora, arch, bazzite, steamos-host, windows-host):
  GPU driver + package + input group, then a canonical "Configure your desktop" funnel.
- Configure your desktop — per compositor (kde, gnome, gamescope, sway): host.env, compositor
  quirks, the headless session, and starting the host.

New shared web-console page (enable · login password · arm pairing) removes the console/password
block that was copy-pasted across all seven host pages. Merged ubuntu-gnome + ubuntu-kde into
ubuntu; renamed fedora-kde to fedora; kept bazzite and steamos-host as dedicated appliance guides
(trimmed of duplication). Moved the KWin headless session, the GNOME EGL/lock traps, and the
gamescope attach/managed model out of the distro pages onto their compositor pages.

Fixed while restructuring: distro-specific paths on kde (kde-desktop-setup.sh is Fedora/Bazzite-only;
the .deb ships host.env.kde under /usr/share/punktfunk-host), the interactive "start the host" step
that was lost in the merge, sway over-claiming Hyprland, and a pre-existing broken anchor in
how-it-works.

Removal of the three old pages was captured by the preceding commit 8ebb614 (a concurrent commit
swept up the staged git-rm); the net docs tree is correct. Fumadocs build + internal link/anchor
check green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-site/content/docs/forgot-password.md

@@ -8,21 +8,20 @@ password. That password is generated — or, on Windows, chosen — when the con
 it lives on the **host**. So if you can't get past the login screen, you recover or change it on the
 host machine itself, not from the browser.
 
+New to the console? See [The Web Console](/docs/web-console) to enable it and arm pairing.
+
 > This is **only** the web console login. It is **not** your client/device pairing — if a client
 > won't connect, that's [Pairing](/docs/pairing), not this password.
 
 ## Find your host
 
-Jump to your host platform for exactly where the password lives and how to read or reset it:
+Find your host platform for exactly where the password lives, then read or reset it below:
 
 | Host | Where the password lives | Section |
 |------|--------------------------|---------|
-| **Ubuntu — GNOME** | `~/.config/punktfunk/web-password` | [Console login password](/docs/ubuntu-gnome#console-login-password) |
-| **Ubuntu — KDE Plasma** | `~/.config/punktfunk/web-password` | [Console login password](/docs/ubuntu-kde#console-login-password) |
-| **Fedora — KDE Plasma** | `~/.config/punktfunk/web-password` | [Console login password](/docs/fedora-kde#console-login-password) |
-| **Bazzite — gamescope** | `~/.config/punktfunk/web-password` | [Console login password](/docs/bazzite#console-login-password) |
-| **SteamOS (host)** | `~/.config/punktfunk/web.env` | [Console login password](/docs/steamos-host#console-login-password) |
-| **Windows host** | `%ProgramData%\punktfunk\web-password` | [Console login password](/docs/windows-host#console-login-password) |
+| **Linux packages (apt / RPM / Bazzite)** | `~/.config/punktfunk/web-password` | [Login password](/docs/web-console#login-password) |
+| **SteamOS (host)** | `~/.config/punktfunk/web.env` | [Login password](/docs/web-console#login-password) |
+| **Windows host** | `%ProgramData%\punktfunk\web-password` | [Login password](/docs/web-console#login-password) · [Windows Host](/docs/windows-host) |
 
 ## The short version