layout: edit homepage info box
chore: add SEO info
layout: edit home page
layout: collapse navbar menu after clicking on an item ONLY on mobile
chore: add feedback button
layout: fix footer
layout: implement sticky footer
feat(google-analytics): add page url when tracking marvel links clicks
feat(quiz): make it possible for a quiz to specify its own display name
feat(quiz-match-characters): fix wrong html
feat(quiz-match-characters): improve quiz description
feat(score): add version number to the score object to be able to update old score formats to new ones