docs: refresh Windows host page for new users; drop stale Status/NVIDIA-only/SudoVDA

Rewrite the Windows host docs page for first-time setup, on par with the
other host guides: remove the standout "Status:" banner, restructure into
Requirements / Install (web console + pairing + configure) / How it works /
Notes & limits.

Bring the content up to date with the shipping host:
- encode is all-vendor (NVENC/AMF/QSV + software fallback), not NVIDIA-only
- virtual display is punktfunk's own pf-vdisplay IDD (SudoVDA removed)
- gamepads need no prerequisite — UMDF drivers bundled; ViGEmBus is gone
- add HDR10 + Vulkan-game HDR layer coverage

Fix the same stale claims where other pages cross-reference the Windows host
(requirements, running-as-a-service, install, roadmap, status).

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

docs-site/content/docs/install.md

@@ -43,12 +43,12 @@ signed installer — see [Windows Host](/docs/windows-host) for what it includes
    ```
 
 3. Run `punktfunk-host-setup-<ver>.exe` (elevated). It installs to `C:\Program Files\punktfunk`,
-   optionally installs the bundled **SudoVDA** virtual-display driver, and registers + starts the
+   installs the bundled **pf-vdisplay** virtual-display driver, and registers + starts the
    `LocalSystem` service (`/VERYSILENT` for an unattended install). Upgrades and uninstall go through
    Add/Remove Programs.
 
-You need an NVIDIA GPU + driver (the host is NVENC-only on Windows). More detail — including the CLI
-`punktfunk-host service install` path — is in
+For hardware encode you need a GPU — NVIDIA (NVENC), AMD (AMF), or Intel (QSV); there's a software
+fallback without one. More detail — including the CLI `punktfunk-host service install` path — is in
 [Running as a Service → Windows](/docs/running-as-a-service#windows).
 
 ## What the packages are