Add settings page (#46)

Fixes #37, fixes #47.

Reviewed-on: Nexus/nexus#46

pubspec.yaml

@@ -4,6 +4,13 @@ version: 0.1.0
 publish_to: none
 
 flutter:
+  fonts:
+    - family: fallback-emoji
+      fonts:
+        - asset: assets/fonts/NotoColorEmoji.ttf
+    - family: fallback-sans
+      fonts:
+        - asset: assets/fonts/Roboto.ttf
   assets:
     - assets/
   uses-material-design: true
@@ -67,6 +74,8 @@ dependencies:
       url: https://github.com/Henry-Hiles/material_3_expressive
       path: packages/navigation_rail_m3e
   m3e_card_list: ^0.1.0
+  xdg_directories: ^1.1.0
+  package_info_plus: ^9.0.1
   
 dev_dependencies:
   build_runner: 2.15.0