When running HTML-files, use npm start if npm-project is found

src/project.cc

@@ -1002,6 +1002,18 @@ void Project::JavaScript::compile_and_run() {
 }
 
 void Project::HTML::compile_and_run() {
+  if(dynamic_cast<NpmBuild *>(build.get())) {
+    std::string command = "npm start";
+
+    if(Config::get().project.clear_terminal_on_compile)
+      Terminal::get().clear();
+
+    Terminal::get().print("Running " + command + "\n");
+    Terminal::get().async_process(command, build->project_path, [command](int exit_status) {
+      Terminal::get().async_print(command + " returned: " + std::to_string(exit_status) + '\n');
+    });
+  }
+  else
     Notebook::get().open_uri(std::string("file://") + Notebook::get().get_current_view()->file_path.string());
 }