fix(docs): add cookie consent popup (#1690)

---------

Signed-off-by: Chris Butler <[email protected]>

mkdocs.yml

@@ -3,6 +3,13 @@ extra:
   analytics:
     property: G-XT3KGMHSY8
     provider: google
+  consent:
+    title: Cookie consent
+    description: >-
+      We use cookies to recognize your repeated visits and preferences, as well as
+      to measure the effectiveness of our documentation and whether users find what
+      they're searching for. With your consent, you're helping us to make our documentation
+      better.
 markdown_extensions:
 - admonition
 - markdown_include.include