feat: add Bookerly font plugin with style selection and SmallerFonts integration

plugins/githubsync/GitHubSyncPlugin.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <Arduino.h>
+
+namespace GitHubSyncPlugin {
+
+    enum class SyncResult {
+        OK,
+        NO_WIFI,
+        GIT_ERROR,
+    };
+
+    SyncResult sync();
+
+}