feat(credits): add ESC key handling; remove about tab from dev panel

include/Cubed/dev_panel.hpp

@@ -53,7 +53,6 @@ private:
     int m_samples_idx = 1;
     int m_threads = 1;
     int m_chunk_style = 0;
-    void show_about_table_bar();
     void show_biome_table_bar();
     void show_time_table_bar();
     void show_cave_table_bar();

include/Cubed/ui/credits_ui.hpp

@@ -11,6 +11,7 @@ public:
     void init() override;
 
 private:
+    bool handle_key_event(const KeyEvent& e) override;
     CreditsScene& m_scene;
 };
 } // namespace Cubed