test: add CrossRefs test documents for dependency cascade testing

Adds 4 documents with 13 cross-references:
- Index.rst: Hub document with 3 labels
- DependentA/B/C.rst: Each references hub and siblings

This enables testing:
- Cross-reference rendering
- Dependency tracking
- Cascade re-rendering when hub is modified

Author: CybotTM

Documentation-rendertest/CrossRefs/DependentA.rst

@@ -0,0 +1,20 @@
+..  include:: /Includes.rst.txt
+
+..  _crossrefs-dependent-a:
+
+===========
+Dependent A
+===========
+
+This document depends on the hub via cross-references.
+
+References to hub:
+
+*   See :ref:`crossrefs-hub` for the main overview
+*   Details in :ref:`crossrefs-section-one`
+*   More at :ref:`crossrefs-section-two`
+
+References to siblings:
+
+*   Related: :ref:`crossrefs-dependent-b`
+*   Also see: :ref:`crossrefs-dependent-c`

Documentation-rendertest/CrossRefs/DependentB.rst

@@ -0,0 +1,19 @@
+..  include:: /Includes.rst.txt
+
+..  _crossrefs-dependent-b:
+
+===========
+Dependent B
+===========
+
+Another document depending on the hub.
+
+References to hub:
+
+*   Main: :ref:`crossrefs-main`
+*   Section: :ref:`crossrefs-section-one`
+
+References to siblings:
+
+*   See also: :ref:`crossrefs-dependent-a`
+*   And: :ref:`crossrefs-dependent-c`

Documentation-rendertest/CrossRefs/DependentC.rst

@@ -0,0 +1,19 @@
+..  include:: /Includes.rst.txt
+
+..  _crossrefs-dependent-c:
+
+===========
+Dependent C
+===========
+
+Third document depending on the hub.
+
+References to hub:
+
+*   Overview: :ref:`crossrefs-hub`
+*   Section two details: :ref:`crossrefs-section-two`
+
+References to siblings:
+
+*   Related A: :ref:`crossrefs-dependent-a`
+*   Related B: :ref:`crossrefs-dependent-b`

Documentation-rendertest/CrossRefs/Index.rst

@@ -0,0 +1,34 @@
+..  include:: /Includes.rst.txt
+
+..  _crossrefs-hub:
+..  _crossrefs-main:
+
+================
+Cross-References
+================
+
+This section tests cross-reference functionality and dependency cascading.
+
+..  _crossrefs-section-one:
+
+Section One
+===========
+
+This is a section that can be referenced by other documents.
+
+..  _crossrefs-section-two:
+
+Section Two
+===========
+
+Another referenceable section.
+
+..  contents:: In this chapter
+    :local:
+    :depth: 2
+
+..  toctree::
+    :titlesonly:
+    :glob:
+
+    *