docs: link back to repo/source in furo (#991)

Author: henryiii

docs/conf.py

@@ -39,6 +39,37 @@
 html_theme = "furo"
 html_title = project
 
+html_theme_options = {
+    "source_repository": "https://github.com/pypa/packaging",
+    "source_branch": "main",
+    "source_directory": "docs/",
+    "footer_icons": [
+        {
+            "name": "GitHub",
+            "url": "https://github.com/pypa/packaging",
+            "html": """
+                <svg stroke="currentColor" fill="currentColor" stroke-width="0"
+                viewBox="0 0 16 16">
+                    <path fill-rule="evenodd" d="M8 0C3.58 0 0 3.58 0 8c0 3.54
+                    2.29 6.53 5.47 7.59.4.07.55-.17.55-.38
+                    0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01
+                    1.08.58 1.23.82.72 1.21 1.87.87
+                    2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95
+                    0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21
+                    2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04
+                    2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82
+                    2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0
+                    1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0 0
+                    16 8c0-4.42-3.58-8-8-8z"></path>
+                </svg>
+            """,
+            "class": "",
+        },
+    ],
+}
+html_copy_source = False
+html_show_sourcelink = False
+
 # -- Options for autodoc ----------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#configuration