🔥Remove sphinx build flag

Seems like it got removed. See readthedocs/sphinx_rtd_theme#1623

Author: lord-haffi

docs/conf.py

@@ -176,7 +176,6 @@ def setup(app):
 # documentation.
 html_theme_options = {
     "logo_only": False,
-    "display_version": True,
     "prev_next_buttons_location": "bottom",
     "style_external_links": False,
     # There is still a bug which will probably get fixed soon