Enhance gitignore

This commit updates the gitignore for the project to follow the
suggested gitignore via `github/gitignore`.

Fixes bitbrain#10

.gitignore

@@ -1,7 +1,16 @@
+# Referenced from: https://github.com/github/gitignore/blob/main/Godot.gitignore
+# Godot 4+ specific ignores
+.godot/
 
 # Godot-specific ignores
 .import/
-godot/.godot/
+export.cfg
+export_presets.cfg
+
+# Imported translations (automatically generated from CSV files)
+*.translation
+
 # Mono-specific ignores
 .mono/
 data_*/
+mono_crash.*.json