ZAP-32; updated styles for generated QR codes; added print icon
ZAP-39; updated styles for homepage content; added circles for steps
* converted ems to rems where needed;
* converted PNG icons to SVG format;
* updated login and form styles (text and paddings);
* added video tutorial placeholder on homepage;
* fixed current page indicator icon (depended on HTML class "selected";
* updated links based on internal link functionality;