docs: Add user overview docs for PipeWire

Dockerfile

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+# Build environment for PipeWire
+#
+# To build the image and tag it with “pw”:
+# docker build . -t pw
+#
+# To run the container with the current directory mounted (so you can build inside the container):
+# docker run -it --rm -v $(pwd):/repo pw
+#
+# In the container, to build docs and not too much else, set up the build directory in “builddir”:
+# meson setup builddir --reconfigure --auto-features=disabled -Ddocs=enabled -Dsession-managers=[] -Dflatpak=disabled -Ddbus=disabled -Dpipewire-alsa=disabled
+#
+# Once configured, build the configured components:
+# cd builddir
+# meson compile
+
+
+FROM ubuntu:24.04
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get update \
+    && apt-get -y install \
+    debhelper-compat \
+    findutils \
+    git \
+    libapparmor-dev \
+    libasound2-dev \
+    libavcodec-dev \
+    libavfilter-dev \
+    libavformat-dev \
+    libdbus-1-dev \
+    libbluetooth-dev \
+    libglib2.0-dev \
+    libgstreamer1.0-dev \
+    libgstreamer-plugins-base1.0-dev \
+    libsbc-dev \
+    libsdl2-dev \
+    libsnapd-glib-dev \
+    libudev-dev \
+    libva-dev \
+    libx11-dev \
+    meson \
+    ninja-build \
+    pkg-config \
+    python3-docutils \
+    systemd
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install \
+    doxygen
+
+USER ubuntu
+WORKDIR /repo
+