Improve microservices cards in dashboard

• Change cards descriptions "Access to MicroserviceName" to real descriptions
• Rename button "Go for it" to "Access microservice"
• Rename "MongoDb" to "MongoExpress"
• Create a global utility function to retrieve URLs correctly

Descriptions suggestions:

• Kibana: "Manage statistics tool"
• Postgresql: "Manage user database"
• MongoExpress: "Manage Mongo database"
• Elasticsearch : "Manage search engine"
• Keycloak: "Manage access portal"
• Portainer: "Manage docker containers"