[ADF-4152] Restructured remaining doc folders and fixed links (#4441)

* [ADF-4152] Moved proc services cloud docs to subfolders

* [ADF-4152] Fixed links in PS cloud docs

* [ADF-4152] Added subfolders and checked links for extensions and insights docs

* [ADF-4152] Moved proc services cloud docs to subfolders

* [ADF-4152] Fixed links in PS cloud docs

* [ADF-4152] Added subfolders and checked links for extensions and insights docs

* [ADF-4152] Fixed links in Proc cloud, Insights and Extensions docs

* [ADF-4152] Updated links in user guide

* [ADF-4152] Fixed broken links in tutorials

* [ADF-4152] Fixed remaining links in core docs

* [ADF-4152] Fixed remaining links in proc services docs

* [ADF-4152] Fixed remaining links in content services docs

* [ADF-4152] Fixed links in breaking changes docs

* [ADF-4152] Updated main README index page

* [ADF-4152] Fixed glitches with preview ext component docs

docs/process-services-cloud/pipes/group-initial.pipe.md

@@ -0,0 +1,33 @@
+---
+Title: Group initial pipe
+Added: v3.0.0
+Status: Active
+Last reviewed: 2019-01-17
+---
+
+# [Group initial pipe](../../../lib/process-services-cloud/src/lib/group/pipe/group-initial.pipe.ts "Defined in group-initial.pipe.ts")
+
+Extracts the initial character from a group name.
+
+## Basic Usage
+
+<!-- {% raw %} -->
+
+```HTML
+<div>
+    Group: {{ currentGroup | groupNameInitial }}
+</div>
+```
+
+<!-- {% endraw %} -->
+
+## Details
+
+This pipe takes a [`GroupModel`](../../../lib/process-services-cloud/src/lib/group/models/group.model.ts)
+object as its parameter and extracts the initial character from the `name`
+property. The initial is a handy way to identify the group in lists and
+other situations where there is limited screen space available.
+
+## See also
+
+-   [Group cloud component](../components/group-cloud.component.md)