docs: user-facing docs revamp — structured product docs + per-platform setup

Replace the dev/agent-log pages with a proper user-facing doc set:

- Getting Started: Introduction (rewritten), How It Works, Quick Start.
- Host Setup: Requirements, then clean per-platform guides — Ubuntu GNOME,
  Ubuntu KDE, Fedora KDE (new), Bazzite (rewritten) — plus Running as a Service
  (desktop / headless GNOME / headless KDE).
- Connecting: Clients overview, Moonlight, Pairing & Trust.
- Configuration: host.env reference, Host CLI, Troubleshooting.
- The dev/design notes (architecture, roadmap, the deferred design specs, CI)
  move to a clearly-separated "Project & Internals" nav section.

Removes the superseded box-specific pages (gnome-box, headless-box, linux-setup,
overview). status.md (the internal progress tracker, with box IPs) is kept as a
file but dropped from the public nav. Site builds clean.

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

docs-site/content/docs/ubuntu-gnome.md

@@ -0,0 +1,113 @@
+---
+title: Ubuntu — GNOME
+description: Set up a punktfunk host on Ubuntu with the GNOME desktop (Mutter).
+---
+
+Set up a punktfunk host on **Ubuntu** (Desktop or Server) running **GNOME**. The host uses GNOME's
+Mutter compositor to create a per-client virtual display. Tested on Ubuntu 24.04+ and GNOME 48+.
+
+> New to this? Skim [Requirements](/docs/requirements) first.
+
+## 1. NVIDIA driver
+
+Install the recommended NVIDIA driver:
+
+```sh
+sudo ubuntu-drivers install      # or: sudo apt install nvidia-driver-<version>
+```
+
+Then make sure the **GL/EGL userspace** is present — GNOME on NVIDIA needs it, and the base driver
+package doesn't always pull it in. Install the `libnvidia-gl` package matching your driver version:
+
+```sh
+sudo apt install libnvidia-gl-<version>   # e.g. libnvidia-gl-550
+```
+
+Reboot, then confirm the driver and KMS modeset:
+
+```sh
+nvidia-smi
+cat /sys/module/nvidia_drm/parameters/modeset   # should print Y
+```
+
+If modeset is not `Y`:
+
+```sh
+echo 'options nvidia-drm modeset=1' | sudo tee /etc/modprobe.d/nvidia-drm.conf
+sudo update-initramfs -u && sudo reboot
+```
+
+> **Secure Boot:** on a machine with Secure Boot **enabled**, the NVIDIA kernel module won't load
+> until you enrol its signing key. If `nvidia-smi` reports it can't talk to the driver, run
+> `sudo mokutil --import /var/lib/shim-signed/mok/MOK.der` (set a one-time password), reboot, and
+> choose **Enrol MOK** at the blue screen. Or disable Secure Boot in firmware.
+
+## 2. Dependencies
+
+Install the build toolchain and runtime libraries:
+
+```sh
+sudo apt install build-essential pkg-config cmake clang libclang-dev nasm git curl \
+  pipewire pipewire-pulse wireplumber libpipewire-0.3-dev libspa-0.2-dev \
+  libwayland-dev wayland-protocols libxkbcommon-dev libopus-dev \
+  libdrm-dev libgbm-dev libegl-dev libgles-dev mesa-common-dev libva-dev \
+  ffmpeg libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libavfilter-dev libavdevice-dev \
+  libnvidia-egl-wayland1 libnvidia-egl-gbm1 libei-dev
+```
+
+Install Rust if you don't have it:
+
+```sh
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+## 3. Build
+
+```sh
+git clone https://git.unom.io/unom/punktfunk.git && cd punktfunk
+cargo build --release -p punktfunk-host
+```
+
+The host binary is at `target/release/punktfunk-host`.
+
+## 4. Configure
+
+The host reads its settings from `~/.config/punktfunk/host.env`. For GNOME:
+
+```sh
+mkdir -p ~/.config/punktfunk
+cat > ~/.config/punktfunk/host.env <<'ENV'
+WAYLAND_DISPLAY=wayland-0
+XDG_CURRENT_DESKTOP=GNOME
+PUNKTFUNK_COMPOSITOR=mutter
+PUNKTFUNK_VIDEO_SOURCE=virtual
+PUNKTFUNK_ZEROCOPY=1
+PUNKTFUNK_INPUT_BACKEND=libei
+ENV
+```
+
+See the [Configuration reference](/docs/configuration) for every option.
+
+## 5. Run
+
+From a terminal **inside your GNOME session** (so the host can reach Mutter):
+
+```sh
+cargo run --release -p punktfunk-host -- serve --native
+```
+
+The host starts listening, prints its fingerprint, and advertises itself on the network. Now
+[connect a client](/docs/clients).
+
+To run it automatically at boot — including on a **headless** machine with no monitor — see
+[Running as a Service](/docs/running-as-a-service).
+
+## Troubleshooting
+
+- **gnome-shell fails to start / "GPU … not supported by EGL":** the NVIDIA GL/EGL userspace is
+  missing. Install `libnvidia-gl-<version>` (step 1) and confirm
+  `/usr/share/glvnd/egl_vendor.d/10_nvidia.json` exists.
+- **Capture fails with "Session creation inhibited":** a **locked** GNOME session blocks screen
+  capture. On a headless/always-on host, disable the lock — see
+  [Running as a Service](/docs/running-as-a-service).
+- More in [Troubleshooting](/docs/troubleshooting).