update getting started links to new start page

_includes/header.html

@@ -34,7 +34,7 @@
           <a {% if current[1] == 'blinka' %}class="active" aria-current="page"{% endif %} href="{{ "/blinka" | relative_url  }}">Blinka</a>
         </div>
         <div class="get-started">
-          <a href="https://learn.adafruit.com/welcome-to-circuitpython">Get Started</a>
+          <a href="{{ "/start" | relative_url }}">Get Started</a>
         </div>
       </nav>
     </div>

_includes/header_mobile.html

@@ -34,7 +34,7 @@
         <li><a {% if current[1] == 'awesome' %}class='active'{% endif %}
                                   href="{{ "/awesome" | relative_url  }}">Awesome</a></li>
         <li><a href="https://www.adafruitdaily.com/category/circuitpython">Newsletter</a></li>
-        <li><a href="https://learn.adafruit.com/welcome-to-circuitpython">Get Started</a></li>
+        <li><a href="{{ "/start" | relative_url }}">Get Started</a></li>
         <li><a href="https://forums.adafruit.com/viewforum.php?f=60">Forums</a></li>
         <li><a href="https://adafru.it/discord" aria-label="Discord"><i class="fab fa-discord"></i> Discord</a></li>
       </ul>

index.html

@@ -176,7 +176,8 @@ <h2>Just the beginning...</h2>
       concept. This makes CircuitPython better for you and everyone who uses it!
     </p>
     <p>
-      <a href="https://learn.adafruit.com/welcome-to-circuitpython" class="action-link include-gap">Get Started</a>
+      <a href="https://learn.adafruit.com/welcome-to-circuitpython"
+               class="action-link include-gap">Get Started</a>
     </p>
     </div>
   </div>