fix: documentation button hidden on tablets

- add jekyll cache folder to .gitignore

Author: Rui Lima

docs/.gitignore

@@ -27,3 +27,4 @@ test.scss
 /styles/node_modules
 /versions
 _site
+.jekyll-cache

docs/_includes/global/navbar.html

@@ -33,7 +33,7 @@
         <span class="is-hidden-touch is-hidden-widescreen">
           Docs
         </span>
-        <span class="is-hidden-tablet-only is-hidden-desktop-only">
+        <span class="is-hidden-desktop-only">
           Documentation
         </span>
       </a>