docs: remove "policy" configuration doc page

This is all part of the well-known settings now

docs/rst/daemon/configuration.rst

@@ -25,7 +25,6 @@ the various options available.
    configuration/settings.rst
    configuration/alsa.rst
    configuration/bluetooth.rst
-   configuration/policy.rst
    configuration/access.rst
    configuration/locations.rst
    configuration/multi_instance.rst

docs/rst/daemon/configuration/meson.build

@@ -7,7 +7,6 @@ sphinx_files += files(
   'settings.rst',
   'alsa.rst',
   'bluetooth.rst',
-  'policy.rst',
   'access.rst',
   'locations.rst',
   'multi_instance.rst',

docs/rst/daemon/configuration/policy.rst

@@ -1,51 +0,0 @@
-.. _config_policy:
-
-Policy Configuration
-====================
-
-wireplumber.conf.d/policy.conf
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This file contains generic default policy properties that can be configured.
-
-* *Settings*
-
-  Example:
-
-  .. code-block::
-
-    wireplumber.properties = {
-      default-policy-move = true
-    }
-
-  The above example will set the ``move`` policy property to ``true``.
-
-  The list of supported properties are:
-
-  .. code-block::
-
-    default-policy-move = true
-
-  Moves session items when metadata ``target.node`` changes.
-
-  .. code-block::
-
-    default-policy-follow = true
-
-  Moves session items to the default device when it has changed.
-
-  .. code-block::
-
-    default-policy-audio.no-dsp = false
-
-  Set to ``true`` to disable channel splitting & merging on nodes and enable
-  passthrough of audio in the same format as the format of the device. Note that
-  this breaks JACK support; it is generally not recommended.
-
-  .. code-block::
-
-    default-policy-duck.level = 0.3
-
-  How much to lower the volume of lower priority streams when ducking. Note that
-  this is a linear volume modifier (not cubic as in PulseAudio).
-