chore: update .gitignore for build artifacts

- Add build/, docs/generated/ to gitignore
- Exclude temporary and generated files from git tracking
- Keep documentation source files in git

Author: WenyinWei

.gitignore

@@ -1,56 +1,56 @@
-# Prerequisites
-*.d
-
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Linker files
-*.ilk
-
-# Debugger Files
-*.pdb
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-*.smod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
-
-
-
-# debug information files
-*.dwo
-
-# Build directories
-.xmake/
-build/
-
-# vscode config
-.vscode/
-
-# Example executables
-simple_standard_parallelism
-standard_parallelism_demo
-test_standard_parallelism
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Linker files
+*.ilk
+
+# Debugger Files
+*.pdb
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+
+
+# debug information files
+*.dwo
+
+# Build directories
+.xmake/
+build/
+
+# vscode config
+.vscode/
+
+# Example executables
+simple_standard_parallelism
+standard_parallelism_demo
+test_standard_parallelism
 parallelism_integration_demo