adding copy buttons to code blocks

docs/conf.py

@@ -10,6 +10,12 @@ version = ''
 # The full version, including alpha/beta/rc tags
 release = 'v0.1'
 
+# Add custom CSS/Javascript
+def setup(app):
+    app.add_javascript("custom.js")
+    app.add_stylesheet("custom.css")
+    app.add_javascript("https://cdn.jsdelivr.net/npm/clipboard@1/dist/clipboard.min.js")
+
 # Enable MathJax for Math
 extensions = ['sphinx.ext.mathjax']