removed vendor/others
updated adminer-custom to v1.5
responsive welcome page
templates: removed $robots

In 500.latte is <meta name="robots" content="noindex"> needed, because HTTP code may not be send
Revert "ErrorPresenter: 500.latte erases HTML output"

This reverts commit 37b7bd190111224685bbb8dfb8ee4e44582c2737.