Custom basic authentication

Fixed

• meta.location needs to show protocol and port
• memuser.showHeaders now works without error

Added

• added basic auth option with custom user and password
• use default JVM timezone for showing timestamps, e.g. meta.created, etc
• created simple index.html home page with getting started links

Changed

• bump versions of several dependencies to fix security warnings
• remove nginxtlsproxy image for e2e testing
• we now use spring TLS configuration for e2e testing
• updated documentation