add: added Publish API & API Explorer links to header drop-down (TKMDPA-438)
add: added Publish API & API Explorer links to header drop-down (TKMDPA-438)

ticketmaster-api/ticketmaster-api.github.io,romil93/ticketmaster-api.github.io,romil93/ticketmaster-api.github.io,ticketmaster-api/ticketmaster-api.github.io,ticketmaster-api/ticketmaster-api.github.io,romil93/ticketmaster-api.github.io,ticketmaster-api-staging/ticketmaster-api-staging.github.io,ticketmaster-api-staging/ticketmaster-api-staging.github.io,ticketmaster-api/ticketmaster-api.github.io,ticketmaster-api/ticketmaster-api.github.io,romil93/ticketmaster-api.github.io