about: Added title and some presentation
contact: Added title to the phone version
includes/portfolio-subnav: Added title to phone version
includes/footer: Added "go to top" functionality in all pages
portfolio/amsterdammers: Removed code to go to top (included now in footer)
bootstrap/css: Added "to-top" class
includes/header (es): Fixed how the menu is displayed on the phone version
images: Changed the thumbnail for SSM