Replaced yeoman favicon
Replaced phone number by email contact
Removed @section mixin + sec-t* themed section which was based on this mixin
This was overkill, now declaring main-title class on the container, instead
of on the <h1> tag
Splitted main title into 3 sentence chunks + splitted main title
container on 2 columns
updated h1 & h4 responsive font sizes in order to fit titles without any CR
on mobile device
Allowing to not define display/box-sizing in @responsive-image mixin
This is typically useful when working on images in lists
Declared partners section
removed useless variables since never re-used