DOC-211 /docs-preview -> /docs-beta

_includes/nav.html

@@ -1,7 +1,7 @@
 <ul>
 {% unless include.recursed %}
   <li>
-    <a  href="/docs-preview/">TinyMCE 5 Preview</a>
+    <a  href="/docs-beta/">TinyMCE 5 Beta</a>
   </li>
 {% endunless %}
 

_includes/template/bodycontents.html

@@ -11,7 +11,7 @@
                 TinyMCE v4
                 <div class="dropdown-arrow"></div>
                 <div class="dropdown-options">
-                    <a class="link-gelato" href="/docs-preview/">TinyMCE v5 Dev Preview</a>
+                    <a class="link-gelato" href="/docs-beta/">TinyMCE v5 Beta</a>
                     <a class="link-gelato" href="/docs">TinyMCE v4</a>
                     <a class="link-gelato" href="/docs-3x/">TinyMCE v3</a>
                 </div>