docs: remove epub documentation build

.readthedocs.yaml

@@ -1,3 +1,7 @@
+# Configuration on how ReadTheDocs (RTD) builds our documentation
+# ref: https://readthedocs.org/projects/jupyterhub/
+# ref: https://docs.readthedocs.io/en/stable/config-file/v2.html
+#
 version: 2
 
 sphinx:
@@ -16,5 +20,8 @@ python:
     - requirements: docs/requirements.txt
 
 formats:
+  # Adding htmlzip enables a Downloads section in the rendered website's RTD
+  # menu where the html build can be downloaded. This doesn't require any
+  # additional configuration in docs/source/conf.py.
+  #
   - htmlzip
-  - epub

docs/source/conf.py

@@ -151,17 +151,6 @@ html_context = {
     "doc_path": "docs",
 }
 
-# -- Epub output --------------------------------------------------------
-
-# Bibliographic Dublin Core info.
-epub_title = project
-epub_author = author
-epub_publisher = author
-epub_copyright = copyright
-
-# A list of files that should not be packed into the epub file.
-epub_exclude_files = ['search.html']
-
 # -- Intersphinx ----------------------------------------------------------
 
 intersphinx_mapping = {