Use button for rules download

Author: RealOrangeOne

docs/rules/index.md

@@ -4,4 +4,4 @@ title: Rules
 
 You can find the rules for Smallpeice 2021 competition here!:
 
-# [Download the rules!](/rules.pdf)
+[Download the rules :fontawesome-solid-download:](../assets/rules.pdf){ .md-button .md-button--primary }

mkdocs.yml

@@ -41,6 +41,7 @@ extra:
 
 # Extensions
 markdown_extensions:
+  - attr_list
   - pymdownx.highlight
   - pymdownx.superfences
   - footnotes
@@ -53,7 +54,8 @@ markdown_extensions:
   - pymdownx.caret
   - pymdownx.details
   - pymdownx.emoji:
-      emoji_generator: !!python/name:pymdownx.emoji.to_svg
+      emoji_index: !!python/name:materialx.emoji.twemoji
+      emoji_generator: !!python/name:materialx.emoji.to_svg
   - pymdownx.inlinehilite
   - pymdownx.keys
   - pymdownx.magiclink