Enable html to be rendered on readthedocs

sdhiscocks · sdhiscocks · commit 691d15ba4662 · 2020-06-04T18:48:40.000+01:00
Per comment: readthedocs/readthedocs.org#4765 (comment)
diff --git a/sphinx_gallery/gen_rst.py b/sphinx_gallery/gen_rst.py
@@ -163,7 +163,7 @@ def __exit__(self, type_, value, tb):
 """
 
 # Header used to include raw html
-html_header = """.. only:: builder_html
+html_header = """.. only:: builder_html or readthedocs
 
     .. raw:: html
 
