Include og:image:width and height to ensure shares of new URLs include an image

Author: hugovk

conf.py

@@ -108,6 +108,10 @@
 # sphinxext-opengraph config
 ogp_site_url = "https://devguide.python.org/"
 ogp_image = "https://devguide.python.org/_static/og-image.png"
+ogp_custom_meta_tags = [
+    '<meta property="og:image:width" content="1200">',
+    '<meta property="og:image:height" content="630">',
+]
 
 # Strip the dollar prompt when copying code
 # https://sphinx-copybutton.readthedocs.io/en/latest/use.html#strip-and-configure-input-prompts-for-code-cells