Drop sphinx docs (#17073)

It is broken, and we only seemed to have been building it for the
federation sender.

Closes https://github.com/element-hq/synapse/issues/16804

1 files changed, 0 insertions, 22 deletions

diff --git a/dev-docs/index.rst b/dev-docs/index.rst
deleted file mode 100644

index 1ef210460a..0000000000
--- a/dev-docs/index.rst
+++ /dev/null
@@ -1,22 +0,0 @@
-.. Synapse Developer Documentation documentation master file, created by
-   sphinx-quickstart on Mon Mar 13 08:59:51 2023.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
-Welcome to the Synapse Developer Documentation!
-===========================================================
-
-.. toctree::
-   :maxdepth: 2
-   :caption: Contents:
-
-   modules/federation_sender
-
-
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`