RHIDP 4573 Discover- Verify existing content is removed from the getting started guide (redhat-developer#648)

* Adds benefits of RHDH module

* modifies about section

* modifies about section

* Modifies the section

* Adds benefits of RHDH module

* Updates the branch with latest changes

All Conflicts:

* Updates the branch

* Updates branch

* Removes existing content

Author: jmagak

Diff for: modules/getting-started/ref-rhdh-sizing.adoc

@@ -10,12 +10,6 @@ As a developer, you can use {product} to experience a streamlined development en
 //customer support links
 include::artifacts/snip-customer-support-info.adoc[]
 
-// rhdh overview
-include::modules/installation/con-rhdh-overview.adoc[leveloffset=+1]
-
-// Sizing
-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]
 include::assemblies/assembly-add-custom-app-file-openshift.adoc[leveloffset=+2]

Diff for: modules/installation/con-rhdh-overview.adoc

@@ -12,10 +12,6 @@ include::artifacts/attributes.adoc[]
 //customer support links
 include::artifacts/snip-customer-support-info.adoc[]
 
-//includes
-include::modules/release-notes/con-release-notes-overview.adoc[leveloffset=+1]
-
-
 include::assemblies/assembly-release-notes-new-features.adoc[leveloffset=+1]