moved module to getting started folder

Author: hmanwani-rh

titles/getting-started-rhdh/title-getting-started.adoc

@@ -14,7 +14,7 @@ include::artifacts/snip-customer-support-info.adoc[]
 include::modules/installation/con-rhdh-overview.adoc[leveloffset=+1]
 
 // Sizing
-include::modules/installation/ref-rhdh-sizing.adoc[leveloffset=+1]
+include::modules/getting-started/ref-rhdh-sizing.adoc[leveloffset=+1]
 
 // supported configs and customization
 include::modules/getting-started/ref-rhdh-supported-configs.adoc[leveloffset=+1]