DOC link to the new getting started (scikit-learn#15060)

Author: adrinjalali

doc/templates/index.html

@@ -7,7 +7,7 @@
       <div class="col-md-6 mb-3 mb-md-0">
         <h1 class="sk-landing-header text-white text-monospace">scikit-learn</h1>
         <h4 class="sk-landing-subheader text-white font-italic mb-3">Machine Learning in Python</h4>
-        <a class="btn sk-landing-btn mb-1" href="{{ pathto('tutorial/basic/tutorial') }}" role="button">Quick Start</a>
+        <a class="btn sk-landing-btn mb-1" href="{{ pathto('getting_started') }}" role="button">Getting Started</a>
         <a class="btn sk-landing-btn mb-1" href="whats_new.html" role="button">Whats New in {{ version }}</a>
         <a class="btn sk-landing-btn mb-1" href="{{ pathto('documentation') }}" role="button">Documentation</a>
       </div>