Re #8583 - index.js uses await
Re #8583 - index.js moved initialization code into mounted
Re #8583 - Loading screen and error reaction in certificate.html
Re #8583 - Details page subject data
Re #8583 - Improved certificate listing
Re #8583 Certificate creation - creation success alert using Bootstrap
Re #8475 - Added code comments
Re #8475 - Created constants.js for Rest API endpoint definitions
Re #8475 - Certificate item component added