Update mkdocs config

mkdocs.yml

@@ -3,6 +3,7 @@ site_url: https://www.starforge.co.uk/site
 nav:
   - Home: index.md
   - About: about.md
+  - Links: links.md
 theme:
   font:
     text: Roboto
@@ -17,6 +18,7 @@ plugins:
   - privacy
 markdown_extensions:
   - attr_list
+  - footnotes
   - pymdownx.emoji:
       emoji_index: !!python/name:material.extensions.emoji.twemoji
       emoji_generator: !!python/name:material.extensions.emoji.to_svg
@@ -28,3 +30,6 @@ extra:
     - icon: fontawesome/brands/itch-io
       link: https://jeremiahfieldhaven.itch.io/
       name: Itch.io
+    - icon: fontawesome/solid/envelope
+      link: mailto:chris@starforge.co.uk
+      name: Email