update installation guide (#2930)
update installation guide (#2930)

* update installation guide

* add perf turning.

* update per comments

* update per comments

reasonerjt/harbor,steven-zou/harbor,wy65701436/harbor,reasonerjt/harbor,steven-zou/harbor,reasonerjt/harbor,steven-zou/harbor,steven-zou/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,steven-zou/harbor,reasonerjt/harbor,steven-zou/harbor,reasonerjt/harbor