Update Aura Logo and default CSS

config/default-sample.env

 NAME="Studio Clock"
-LOGO="https://gitlab.servus.at/aura/meta/-/raw/master/assets/images/aura-logo.png"
-LOGO_SIZE="100px" 
+LOGO="https://gitlab.servus.at/aura/meta/-/raw/master/assets/images/aura-logo-color-trans.png"
+LOGO_SIZE="100px"
 API_URL="http://localhost:8008/api/v1/"
 UNKNOWN_TITLE="Unknown Title"
 NO_CURRENT_TIMESLOT="No show playing"
 NO_NEXT_TIMESLOT="Nothing scheduled next"
 PLAY_OFFSET=3
-CSS=""
+CSS=" "
 FALLBACK_TEXT="FALLBACK"