Add pages on exporting and compiling for visionOS

Since the instructions are basically identical to iOS, this links
to the respective iOS exporting/compiling pages (with a reminder
that visionOS support is still limited for now).

Author: Calinou

contributing/development/compiling/compiling_for_visionos.rst

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+.. _doc_compiling_for_visionos:
+
+Compiling for visionOS
+======================
+
+.. seealso::
+
+    This page describes how to compile visionOS export template binaries from source.
+    If you're looking to export your project to visionOS instead, read :ref:`doc_exporting_for_visionos`.
+
+Compiling instructions for visionOS are identical to :ref:`doc_compiling_for_ios`,
+except you should replace instances of the ``ios`` platform name with ``visionos``
+in SCons options. See the linked page for details.

tutorials/export/exporting_for_visionos.rst

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+.. _doc_exporting_for_visionos:
+
+Exporting for visionOS
+======================
+
+.. seealso::
+
+    This page describes how to export a Godot project to visionOS.
+    If you're looking to compile export template binaries from source instead,
+    read :ref:`doc_compiling_for_visionos`.
+
+Exporting instructions for visionOS are identical to :ref:`doc_compiling_for_ios`,
+except you should add a **visionOS** export preset instead of **iOS**.
+See the linked page for details.
+
+.. note::
+
+    Note that currently, only exporting an application for use on a flat
+    plane within the headset is supported. Immersive experiences are not supported.