Remove paid support callout
Mention we don't support custom installs any time.
@@ -12,9 +12,8 @@ It has those features and more!
.. warning::
These documents are maintained by the community, and might not be up to date.
- Read the Docs developers do not support custom installs of our software
- in our public issue tracker. For additional support of a custom installation,
- please see our `paid support plans <https://readthedocs.com/services/#open-source-support>`_.
+ Read the Docs developers do not support custom installs of our software,
+ as mentioned in our :doc:`open-source-philosophy`.
.. toctree::
:maxdepth: 2
