swap dart with Flutter on reference top page

apps/reference/docs/reference.mdx

@@ -26,7 +26,7 @@ Reference documentation for the official Supabase client libraries, APIs, and to
     </div>
     {/* DART */}
     <div class="col col--6">
-      <ButtonCard icon={useBaseUrl("/img/icons/dart-icon.svg")} class="card" to={useBaseUrl("/reference/dart")} style={{ height: '100%' }} title="Dart" description="Dart and Flutter documentation."/>
+      <ButtonCard icon={useBaseUrl("/img/icons/flutter-icon.svg")} class="card" to={useBaseUrl("/reference/dart")} style={{ height: '100%' }} title="Flutter" description="Flutter and Dart documentation."/>
     </div>
     {/* CLI */}
     <div class="col col--6">

apps/reference/static/img/icons/flutter-icon.svg

@@ -0,0 +1,94 @@
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