[8.x] [Serverless][8.16] New notes experience - Impacted screenshots and misc updates (backport #6072) (#6078)

* [Serverless][8.16] New notes experience - Impacted screenshots and misc updates (#6072)

* Re-adds images

* Adds notes to landing page for investigative tools

* Fix Serverless TOC

* Fixes threat intel images

* Adds size configs

* fixes file name

* Minor tweaks

(cherry picked from commit 1b13703)

# Conflicts:
#	docs/serverless/alerts/view-alert-details.asciidoc
#	docs/serverless/images/interactive-investigation-guides/-detections-ig-alert-flyout-invest-tab.png
#	docs/serverless/images/interactive-investigation-guides/-detections-ig-alert-flyout.png
#	docs/serverless/images/interactive-investigation-guides/-detections-ig-timeline-query.png
#	docs/serverless/images/interactive-investigation-guides/-detections-ig-timeline.png
#	docs/serverless/images/timeline-templates-ui/-events-create-a-timeline-template-field.png
#	docs/serverless/images/timelines-ui/-events-correlation-tab-eql-query.png
#	docs/serverless/images/timelines-ui/-events-timeline-sidebar.png
#	docs/serverless/images/timelines-ui/-events-timeline-ui-renderer.png
#	docs/serverless/images/timelines-ui/-events-timeline-ui-updated.png
#	docs/serverless/images/view-alert-details/-detections-alert-details-flyout-preview-panel.gif
#	docs/serverless/images/view-alert-details/-detections-alert-details-flyout-right-panel.png
#	docs/serverless/images/view-alert-details/-detections-expand-details-button.png
#	docs/serverless/images/view-alert-details/-detections-expanded-correlations-view.png
#	docs/serverless/images/view-alert-details/-detections-expanded-entities-view.png
#	docs/serverless/images/view-alert-details/-detections-expanded-prevalence-view.png
#	docs/serverless/images/view-alert-details/-detections-expanded-threat-intelligence-view.png
#	docs/serverless/images/view-alert-details/-detections-open-alert-details-flyout.gif
#	docs/serverless/index.asciidoc
#	docs/serverless/investigate/investigate-events.asciidoc
#	docs/serverless/investigate/timeline-templates-ui.asciidoc
#	docs/serverless/investigate/timelines-ui.asciidoc
#	docs/serverless/osquery/invest-guide-run-osquery.asciidoc
#	docs/serverless/rules/interactive-investigation-guides.asciidoc

* Delete docs/serverless directory and its contents

---------

Co-authored-by: Nastasha Solomon <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

docs/detections/alerts-view-details.asciidoc

@@ -52,7 +52,7 @@ IMPORTANT: If you've enabled grouping on the Alerts page, the alert details flyo
 [[preview-panel]]
 === Preview panel 
 
-Some areas in the flyout provide previews when you click on them. For example, clicking **Show rule summary** in the rule description displays a preview of the rule's details. To close the preview, click **x**. 
+Some areas in the flyout provide previews when you click on them. For example, clicking **Show rule summary** in the rule description displays a preview of the rule's details. To close the preview, click **Back** or **x**. 
 
 [role="screenshot"]
 image::images/alert-details-flyout-preview-panel.gif[Preview panel of the alert details flyout, 65%]
@@ -67,13 +67,13 @@ The left panel provides an expanded view of what's shown in the right panel. To
 +
 
 [role="screenshot"]
-image::images/expand-details-button.png[Expand details button at the top of the alert details flyout, 45%]
+image::images/expand-details-button.png[Expand details button at the top of the alert details flyout, 65%]
 
 * Click one of the section titles on the **Overview** tab within the right panel. 
 +
 
 [role="screenshot"]
-image::images/alert-details-flyout-left-panel.png[Left panel of the alert details flyout, 45%]
+image::images/alert-details-flyout-left-panel.png[Left panel of the alert details flyout, 65%]
 
 [discrete]
 [[about-section]]
@@ -201,7 +201,7 @@ From the right panel, click **Threat intelligence** to open the expanded Threat
 NOTE: The expanded threat intelligence view queries indices specified in the `securitySolution:defaultThreatIndex` advanced setting. Refer to <<update-threat-intel-indices, Update default Elastic Security threat intelligence indices>> to learn more about threat intelligence indices. 
 
 [role="screenshot"]
-image::images/expanded-threat-intelligence-view.png[Expanded view of threat intelligence on the alert, 70%]
+image::images/expanded-threat-intelligence-view.png[Expanded view of threat intelligence on the alert, 80%]
 
 The expanded Threat intelligence view shows individual indicators within the alert document. You can expand and collapse indicator details by clicking the arrow button at the end of the indicator label. Each indicator is labeled with values from the `matched.field` and `matched.atomic` fields and displays the threat intelligence provider. 
 
@@ -256,7 +256,7 @@ NOTE: To access data about alerts related by process ancestry, you must have a h
 From the right panel, click **Correlations** to open the expanded Correlations view within the left panel. 
 
 [role="screenshot"]
-image::images/expanded-correlations-view.png[Expanded view of correlation data, 65%]
+image::images/expanded-correlations-view.png[Expanded view of correlation data, 75%]
 
 In the expanded view, corelation data is organized into several tables: