Fix readthedocs build (#4667)

* fix

* changelog

Author: rusty1s

CHANGELOG.md

@@ -23,7 +23,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added support for graph-level outputs in `to_hetero` ([#4582](https://github.com/pyg-team/pytorch_geometric/pull/4582))
 - Added `CHANGELOG.md` ([#4581](https://github.com/pyg-team/pytorch_geometric/pull/4581))
 ### Changed
-- Make use of the `pyg_sphinx_theme` documentation template ([#4664](https://github.com/pyg-team/pyg-lib/pull/4664))
+- Make use of the `pyg_sphinx_theme` documentation template ([#4664](https://github.com/pyg-team/pyg-lib/pull/4664), [#4667](https://github.com/pyg-team/pyg-lib/pull/4667))
 - Refactored reading molecular positions from sdf file for qm9 datasets ([4654](https://github.com/pyg-team/pytorch_geometric/pull/4654))
 - Fixed `MLP.jittable()` bug in case `return_emb=True` ([#4645](https://github.com/pyg-team/pytorch_geometric/pull/4645), [#4648](https://github.com/pyg-team/pytorch_geometric/pull/4648))
 - The generated node features of `StochasticBlockModelDataset` are now ordered with respect to their labels ([#4617](https://github.com/pyg-team/pytorch_geometric/pull/4617))

docs/source/conf.py

@@ -22,7 +22,6 @@
 html_favicon = ('https://raw.githubusercontent.com/pyg-team/pyg_sphinx_theme/'
                 'master/pyg_sphinx_theme/static/img/favicon.png')
 
-master_doc = 'index'
 add_module_names = False
 autodoc_member_order = 'bysource'