Update introduction

app/src/main/java/org/isoron/uhabits/IntroActivity.java

@@ -40,10 +40,6 @@ public class IntroActivity extends AppIntro2
                 getString(R.string.intro_description_2), R.drawable.intro_icon_2,
                 Color.parseColor("#ffa726")));
 
-        addSlide(AppIntroFragment.newInstance(getString(R.string.intro_title_3),
-                getString(R.string.intro_description_3), R.drawable.intro_icon_3,
-                Color.parseColor("#7cb342")));
-
         addSlide(AppIntroFragment.newInstance(getString(R.string.intro_title_4),
                 getString(R.string.intro_description_4), R.drawable.intro_icon_4,
                 Color.parseColor("#9575cd")));