[Docs]Timeline and Template UI updates (elastic#84)

* timeline and template updates

* uncomments out original timeline section in SIEM UI

* removes original timeline IDs to avoid build conflict

* add all actions screenshot

* add all actions screenshot

* corrections

* adds filter explanation and legend

Author: benskelker

docs/siem/images/timeline-ui.png

@@ -14,4 +14,8 @@ include::detections/machine-learning/ml-index.asciidoc[]
 
 include::detections/detections-index.asciidoc[]
 
+include::timeline/timeline-ui-overview.asciidoc[]
+
+include::timeline/timeline-templates.asciidoc[]
+
 include::cases/cases-index.asciidoc[]

docs/siem/index.asciidoc

@@ -233,7 +233,6 @@ The Cases page is used to open and track security issues directly in the
 image::images/cases-ui-home.png[]
 
 [float]
-[[timelines-ui]]
 == Timelines
 
 Use Timeline as your workspace for alert investigations or threat hunting.
@@ -260,7 +259,6 @@ can also link to timelines from Cases and external ticketing systems.
 
 
 [discrete]
-[[raw]]
 ==== Focus on signals or raw events
 
 Many security events in Timeline are presented in an easy-to-follow rendered
@@ -272,7 +270,6 @@ You can click and expand events from within Timeline to see the underlying
 event data, either in tabular form, as as {es} JSON.
 
 [discrete]
-[[narrow-expand]]
 ==== Narrow or expand your query
 
 You can specify logical `AND` and `OR` operations with an item's placement in
@@ -281,7 +278,6 @@ sets are `OR`-ed together. As you hover the item over the drop area, you can see
 whether your placement is on target to create an `AND` or `OR` filters.
 
 [discrete]
-[[pivot]]
 ==== Pivot on a data point
 
 Click a filter to access additional operations such as exclude, temporarily
@@ -290,7 +286,6 @@ item so that it is excluded.
 
 [discrete]
 [[row-renderer]]
-==== Get more context for each event
 
 As you build and modify your queries, you can see the results of your
 interactions in the details pane below.
@@ -301,7 +296,6 @@ event. If you see a particular item that interests you, you can drag it to the
 drop area for further introspection.
 
 [discrete]
-[[import-export-timelines]]
 ==== Export and import timelines
 
 You can import and export timelines, which enables importing timelines from one
@@ -320,7 +314,6 @@ then select _Export selected_.
 the timeline `ndjson` file.
 
 [discrete]
-[[other]]
 ==== Other actions
 
 The Timeline is flexible and highly interactive.  As you would expect, the