Update installation guide and fix binary link (#1067)
Update installation guide and fix binary link (#1067)

* Add geo server link and fix druid link

* change location of geo server binary

* add caution message

* add formatting

* change from id to username

metatron-app/metatron-discovery,metatron-app/metatron-discovery,metatron-app/metatron-discovery,metatron-app/metatron-discovery,metatron-app/metatron-discovery,metatron-app/metatron-discovery,metatron-app/metatron-discovery