docs: decrease page title font size to h3

This looks nicer when viewing on a 15in laptop screen. Also, it lines up perfectly with the A+DT icon on the sidebar

Author: shanmukhateja

demo/src/app/base-demo/base-demo.component.html

@@ -2,7 +2,7 @@
  <div class="container">
  <div class="row">
  <div class="col">
- <h2 class="header center-on-small-only">{{pageTitle}}</h2>
+ <h3 class="header center-on-small-only">{{pageTitle}}</h3>
  </div>
  </div>
  </div>

demo/src/app/getting-started.component.html

@@ -2,7 +2,7 @@
  <div class="container">
  <div class="row">
  <div class="col s12 m9">
- <h1 class="header center-on-small-only">Installation</h1>
+ <h3 class="header center-on-small-only">Installation</h3>
  </div>
  </div>
  </div>

demo/src/app/person.component.html

@@ -2,7 +2,7 @@
  <div class="container">
  <div class="row">
  <div class="col s12 m9">
- <h1 class="header center-on-small-only">Person details</h1>
+ <h3 class="header center-on-small-only">Person details</h3>
  </div>
  </div>
  </div>

demo/src/app/welcome.component.html

@@ -2,7 +2,7 @@
  <div class="container">
  <div class="row">
  <div class="col s12 m9">
- <h1 class="header center-on-small-only">Angular DataTables</h1>
+ <h3 class="header center-on-small-only">Angular DataTables</h3>
  </div>
  </div>
  </div>