ER-15 Fixes

A ever-evolving list of minor fixes encountered during the engineering run:

• new cert for gstlalcbc user
• new default values for gunicorn configuration
• remove Labels: row from superevent table in public-facing view (@roberto.depietri)
• add a link to return to object page from files page
• relax annotation throttle for authorized users
• lots of pre-O4 cert changes
• test change to improve performance of public view