docs: first-class Linux + Windows positioning + IDD-push differentiator

Drop the "Linux-first" framing across the README and docs site in favor of
first-class Linux AND Windows hosts, and surface the Windows IDD-push
virtual-display path as a distinct differentiator (punktfunk's own indirect
display driver the host pushes frames into — a real virtual display, no physical
monitor or dummy plug, even on the secure desktop).

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

docs-site/content/docs/index.mdx

@@ -1,19 +1,21 @@
 ---
 title: Introduction
-description: Low-latency desktop and game streaming from a Linux host to any of your devices.
+description: Low-latency desktop and game streaming from a Linux or Windows host to any of your devices.
 ---
 
 import { Cards, Card } from 'fumadocs-ui/components/card'
 
-**punktfunk** streams your Linux desktop or games to your other devices — a laptop, a Mac, a tablet,
+**punktfunk** streams your desktop or games to your other devices — a laptop, a Mac, a tablet,
 a TV — at low latency and at **each device's own resolution and refresh rate**. Run the host on a
-Linux machine with an NVIDIA GPU, connect a client, and you're streaming.
+Linux machine or a Windows PC, connect a client, and you're streaming.
 
 It's built for the things that make streaming feel native:
 
 - **Your device's exact mode.** The host spins up a virtual display sized to the client that's
   connecting — 1080p60 to your laptop, 1440p120 to your desktop, 4K to your TV — at the same time.
-  No letterboxing, no scaling, no juggling your real monitors.
+  No letterboxing, no scaling, no juggling your real monitors. On Windows that's punktfunk's own
+  indirect display driver, frames pushed straight in — so there's no physical monitor or dummy HDMI
+  plug to deal with, even on the secure desktop.
 - **Low latency, GPU end to end.** Frames go straight from the compositor to the GPU encoder
   (NVENC) with zero CPU copies, and over a transport tuned for responsiveness rather than throughput.
 - **Works with the apps you already have.** punktfunk speaks the GameStream protocol, so any
@@ -34,9 +36,9 @@ It's built for the things that make streaming feel native:
 
 ## What you need
 
-- A **Linux host** with an **NVIDIA GPU** (for the NVENC hardware encoder) running one of the
-  [supported setups](/docs/requirements): **Ubuntu** (GNOME or KDE), **Fedora** (KDE), or **Bazzite**.
-  A native [**Windows host**](/docs/windows-host) (NVIDIA-only) is also available.
+- A **host** with a supported GPU — either a **Linux** machine running one of the
+  [supported setups](/docs/requirements) (**Ubuntu** GNOME or KDE, **Fedora** KDE, or **Bazzite**), or
+  a **[Windows](/docs/windows-host) PC**.
 - A **client device** to stream to — there are native apps for **macOS, iOS/iPadOS, tvOS, Linux,
   Windows, and Android**, plus any device that runs **Moonlight**.
 - Both on the **same network** (LAN or VPN). punktfunk is designed for a trusted local network.