[ADF-2559] Sidenav layout (#3119)

* First step of extraction

* Add sidenav-layout to demo-shell

* Fix some sidenav-layout styles

* Fix tests

* Add documentation

* Fix typescript transpiler's stomache

* Modify component's directive's interface

* Enrich documentation

* Another documentation enrichment

* Fix tests and mobile expanded issue

demo-shell/src/app/components/home/home.component.html

@@ -1,4 +1,4 @@
-<header class="adf-home-background adf-primary-background-color">
+<header class="adf-home-background">
     <div class="adf-home-section ad">
         <div class="adf-home-headline">
             <h1 class="mat-h1">ADF</h1>

demo-shell/src/app/components/home/home.component.scss

@@ -1,3 +1,9 @@
+:host {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
 .adf-home-header-background {
     overflow: hidden;
 }
@@ -8,6 +14,7 @@
 }
 
 .adf-home-headline {
+
     h1 {
         font-size: 56px;
         font-weight: 300;