Remove ./do watch task

[MAILPOET-3500]

RoboFile.php

@@ -33,21 +33,6 @@ class RoboFile extends \Robo\Tasks {
       ->run();
   }
 
-  public function watch() {
-    $this->say('Warning: this lints and compiles all files, not just the changed one. Use separate tasks watch:js and watch:css for faster and more efficient watching.');
-    $cssFiles = $this->rsearch('assets/css/src/', ['scss']);
-    $jsFiles = $this->rsearch('assets/js/src/', ['js', 'jsx', 'ts', 'tsx']);
-
-    $this->taskWatch()
-      ->monitor($jsFiles, function() {
-        $this->compileJs();
-      })
-      ->monitor($cssFiles, function() {
-        $this->compileCss();
-      })
-      ->run();
-  }
-
   public function watchCss() {
     $cssFiles = $this->rsearch('assets/css/src/', ['scss']);
     $this->taskWatch()