Remove deleted pages from Stack Overview (#700)

Author: lcawl

docs/en/getting-started/get-started-stack.asciidoc

@@ -21,8 +21,8 @@ laptop.
 IMPORTANT: Implementing security is a critical step in setting up the {stack}.
 To get up and running quickly with a sample installation, you skip those steps
 right now. Before sending sensitive data across the network, make sure you
-{stack-ov}/elasticsearch-security.html[secure the {stack}] and enable
-{stack-ov}/encrypting-communications.html[encrypted communications].
+{ref}/elasticsearch-security.html[secure the {stack}] and enable
+{ref}/encrypting-communications.html[encrypted communications].
 
 [float]
 [[install-prereqs]]
@@ -1020,7 +1020,7 @@ Next, you'll want to set up the {stack} {security-features} and activate your
 trial license so you can unlock the full capabilities of the {stack}. To learn
 how, read:
 
-* {stack-ov}/elasticsearch-security.html[Securing the {stack}]
+* {ref}/elasticsearch-security.html[Securing the {stack}]
 * {stack-ov}/license-management.html[License Management]
 
 Want to get up and running quickly with metrics monitoring and

docs/en/stack/introduction.asciidoc

@@ -6,15 +6,6 @@ any format and search, analyze, and visualize it in real time.
 
 For a quick overview, see: https://www.elastic.co/products
 
-
-[float]
-=== Where to Go Next
-
-* {stack-gs}/get-started-elastic-stack.html[Getting started with the {stack}]
-* <<security-getting-started, Getting Started with Security>>
-* {kibana-ref}/xpack-reporting.html[Getting Started with Reporting]
-* {kibana-ref}/graph-getting-started.html[Getting Started with Graph]
-
 [float]
 === Have Comments, Questions, or Feedback?
 

docs/en/stack/license.asciidoc

@@ -31,7 +31,7 @@ you install in {kib} or by using the {ref}/update-license.html[update license AP
 
 TIP: If you are using a basic or trial license, {security-features} are disabled
 by default. In all other licenses, {security-features} are enabled by default;
-you must {stack-ov}/security-getting-started.html[secure the {stack}] or disable
+you must {ref}/security-getting-started.html[secure the {stack}] or disable
 the {security-features}. 
 
 --

docs/en/stack/ml/anomaly-detection/stopping-ml.asciidoc

@@ -30,7 +30,7 @@ POST _ml/datafeeds/feed1/_stop
 // TEST[skip:setup:server_metrics_startdf]
 
 NOTE: You must have `manage_ml`, or `manage` cluster privileges to stop {dfeeds}.
-For more information, see <<security-privileges>>.
+For more information, see {ref}/security-privileges.html[Security privileges].
 
 A {dfeed} can be started and stopped multiple times throughout its lifecycle.
 
@@ -69,7 +69,7 @@ POST _ml/anomaly_detectors/job1/_close
 // TEST[skip:setup:server_metrics_openjob]
 
 NOTE: You must have `manage_ml`, or `manage` cluster privileges to stop {dfeeds}.
-For more information, see <<security-privileges>>.
+For more information, see {ref}/security-privileges.html[Security privileges].
 
 {anomaly-jobs-cap} can be opened and closed multiple times throughout their
 lifecycle.

docs/en/stack/ml/df-analytics/ecommerce-outliers.asciidoc

@@ -30,7 +30,8 @@ You also need `read` and `view_index_metadata` index privileges on the source
 indices and `read`, `create_index`, and `index` privileges on the destination
 indices. 
 
-For more information, see <<security-privileges>> and <<built-in-roles>>.
+For more information, see {ref}/security-privileges.html[Security privileges] and
+{ref}/built-in-roles.html[Built-in roles].
 --
 
 . Create a {transform} that generates an entity-centric index with numeric or