Remove outdated tutorial (#3722)

* Remove outdated tutorial

* Remove obsolete link

* Remove tutorial

* Remove link

README.md

@@ -16,7 +16,6 @@ Material Components for iOS are written in Objective-C and support Swift and Int
 - [How To Use MDC-iOS](docs/)
 - [All Components](components/)
 - [Demo Apps](demos/)
-- [Tutorial](docs/tutorial)
 - [Contributing](contributing/)
 - [MDC-iOS on Stack Overflow](https://www.stackoverflow.com/questions/tagged/material-components+ios) (external site)
 - [Material.io](https://material.io) (external site)

docs/README.md

@@ -15,7 +15,6 @@ Material Components for iOS should be immediately useable out of the box with
 Apple's standard development tool chain.
 
 <ul class="icon-list">
-  <li class="icon-list-item icon-list-item--guide"><a href="tutorial/">Tutorial</a></li>
   <li class="icon-list-item icon-list-item--guide"><a href="build-env/">Build environment</a></li>
   <li class="icon-list-item icon-list-item--guide"><a href="../components/schemes/">Theming</a></li>
   <li class="icon-list-item icon-list-item--guide"><a href="supporting-shapes/">Supporting Shapes</a></li>

docs/docsite-index.md

@@ -144,9 +144,6 @@ An easy way to create beautiful apps with modular and customizable UI compo
       <li class="icon-list-item icon-list-item--components">
         <a href="../components">View the Component Documentation</a>
       </li>
-      <li class="icon-list-item icon-list-item--code">
-        <a href="tutorial/#sample-code">Explore our Code Samples</a>
-      </li>
       <li class="icon-list-item icon-list-item--github">
         <a href="https://github.com/material-components/material-components-ios/">View the project on GitHub</a>
       </li>