Fix #63
Update index.html

Removed temporary bitly tracking
Merge pull request #64 from SAPlayer/patch-1

Toggle menu visibility on mobile hamburger click
Minor fixes
Merge remote-tracking branch 'upstream/gh-pages' into german-translation
Remove obsolete installation instructions
Merge pull request #66 from SAPlayer/patch-1

Remove obsolete installation instructions
Translation updates, SEO
Merge remote-tracking branch 'upstream/gh-pages' into german-translation