Update public/index.html

See merge request geovistoogsi/ar!88

Update public/index.html, public/previewImages/placeholder.png,...

See merge request geovistoogsi/ar!87

Update public/index.html, public/previewImages/placeholder.png, public/previewImages/exit.png, public/previewImages/robot.png

Test for menu bar with placeholder image

See merge request geovistoogsi/ar!86

Update public/index.html

See merge request geovistoogsi/ar!84

Update public/index.html

See merge request geovistoogsi/ar!83

Update public/index.html

See merge request geovistoogsi/ar!82

Update public/index.html

See merge request geovistoogsi/ar!81

Update public/index.html

See merge request !80

Update public/index.html

See merge request geovistoogsi/ar!79

Update public/index.html

See merge request geovistoogsi/ar!78

Update public/index.html

See merge request geovistoogsi/ar!77

Update public/index.html

See merge request geovistoogsi/ar!76

Update public/index.html

See merge request geovistoogsi/ar!75

Update public/index.html

See merge request geovistoogsi/ar!74

Update public/index.html

See merge request !73

Update public/index.html

See merge request !72

Update public/index.html

See merge request !71

Update public/index.html

See merge request !70

Update public/index.html

See merge request !69

Update public/index.html

See merge request !68