chore: add fonts

lib/models/code.dart

@@ -13,7 +13,9 @@ class CodeModel with ChangeNotifier {
     'Inconsolata',
     'PT Mono',
     'Source Code Pro',
-    'Ubuntu Mono'
+    'Ubuntu Mono',
+    'Cascadia Code',
+    'JetBrains Mono',
   ];
 
   String _theme = 'github-gist';

pubspec.yaml

@@ -102,3 +102,16 @@ flutter:
         - asset: fonts/UbuntuMono-BoldItalic.ttf
           style: italic
           weight: 700
+    - family: Cascadia Code
+      fonts:
+        - asset: fonts/Cascadia.ttf
+    - family: JetBrains Mono
+      fonts:
+        - asset: fonts/JetBrainsMono-Regular.ttf
+        - asset: fonts/JetBrainsMono-Italic.ttf
+          style: italic
+        - asset: fonts/JetBrainsMono-Bold.ttf
+          weight: 700
+        - asset: fonts/JetBrainsMono-Bold-Italic.ttf
+          style: italic
+          weight: 700