refactor: Update include directives and use std::cout for output

Author: FrozenLemonTee

examples/basic.cpp

@@ -1,8 +1,9 @@
-import std;
+#include <iostream>
+
 import mcpplibs.templates;
 
 int main() {
-    std::println("=== mcpplibs.templates basic example ===");
-    mcpplibs::templates::hello_mcpp();
-    return 0;
+  std::cout << "=== mcpplibs.templates basic example ===\n";
+  mcpplibs::templates::hello_mcpp();
+  return 0;
 }

src/templates.cppm

@@ -1,13 +1,9 @@
 module;
-
+#include <iostream>
 export module mcpplibs.templates;
 
-import std;
-
 namespace mcpplibs::templates {
 
-    export void hello_mcpp() {
-        std::println("hello mcpp!");
-    }
+export void hello_mcpp() { std::cout << "hello mcpp!\n"; }
 
-}
+} // namespace mcpplibs::templates