Add logo (#2)

* Add logo

* Use white logo with moons

Author: jtpio

conf.py

@@ -151,7 +151,6 @@
     # Specify a base_url used to generate sitemap.xml. If not
     # specified, then no sitemap will be built.
     "base_url": "https://jupyterlab-contrib.github.io",
-    "logo_icon": "&#xe87b",
     # Set the color and the accent color
     "color_primary": "deep-orange",
     "color_accent": "orange",
@@ -166,6 +165,8 @@
     "globaltoc_includehidden": False,
 }
 
+html_logo = "logo.png"
+
 
 def setup(app):
     app.add_config_value("recommonmark_config", {"enable_auto_toc_tree": True}, True)