Sphinx 6.x / Docutils 0.18.x is totally different (HTML5, CSS grid, e…

…tc.) and renders our footnotes with code-block wrong (and maybe other problems). Force sphinx<6, docutils<0.18 for now. See readthedocs/sphinx_rtd_theme#1411.

docs/installing/installer.rst

@@ -642,13 +642,15 @@ That being said, we still recommend running :program:`k3s check-config` and inte
 
 .. [#fnuser]
 
-   If :program:`install-lockss` was invoked with the ``--skip-check-system-user`` option, you will see the message:
+   .. compound::
 
-   .. code-block:: text
+      If :program:`install-lockss` was invoked with the ``--skip-check-system-user`` option, you will see the message:
+
+      .. code-block:: text
 
-      [success] Skipping (--skip-check-system-user)
+         [success] Skipping (--skip-check-system-user)
 
-   and :program:`install-lockss` will successfully proceed to the next phase, :ref:`configuring-iptables` (:numref:`configuring-iptables`).
+      and :program:`install-lockss` will successfully proceed to the next phase, :ref:`configuring-iptables` (:numref:`configuring-iptables`).
 
 .. [#fniptables]