add pictures and text to easy help mainpage

public/img/help-settings-blacklist-trashcan.jpg

public/img/help-settings-blacklist.jpg

public/img/help-settings-safesearch.png

public/img/help-used-search-engine-red.jpg

public/img/help-used-search-engine.jpg

resources/lang/de/help/easy-language/help-mainpages.php

resources/less/metager/pages/help-easy-language.less

resources/views/help/easy-language/help-mainpages.blade.php