Remove old .gitignore entry. Add more macOS junk exclusions. (#16167)

.gitignore

@@ -3,6 +3,7 @@
 *.swp
 *~
 .DS_Store
+._*
 
 # Build artifacts
 .clang_complete
@@ -19,7 +20,6 @@
 # QMK-specific
 api_data/v1
 doxygen/
-quantum/version.h
 *.bin
 *.eep
 *.hex