fix broken link to Helm Chart
fix broken link to Helm Chart

Probably it's better to update the https://github.com/goharbor/harbor/blob/master/docs/installation_guide.md to point to the https://github.com/goharbor/harbor-helm rather than this deprecated guide

Signed-off-by: arkadiy kraportov <c0c626026ebb87fd340a14939b4792e346d6c7f3@gmail.com>

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