🔧 Update .gitignore and refactor print logic in hello.zig

.gitignore

@@ -1,3 +1,4 @@
+.zig-cache/
 # ---> macOS
 # General
 .DS_Store

hello.zig

@@ -1,7 +1,6 @@
 const std = @import("std");
 
 pub fn main() !void {
-    const stdout = std.io.getStdOut().writer();
+    std.debug.print("Hello, {s}!\n", .{"world"});
-    try stdout.print("Hello, {s}!\n", .{"world"});
 }