Added a tab grid to the getting started landing page

docs/getting_started/index.md

@@ -3,17 +3,25 @@
 ::::{grid} 
 :gutter: 1 1 1 2
 
+:::{grid-item-card} {octicon}`chevron-right;2.5em;sd-mr-1` Try Online
+:link: getting_started/sandbox_intro.md
+:link-type: doc
+
+Try chainladder online.
+:::
+
 :::{grid-item-card} {octicon}`desktop-download;2.5em;sd-mr-1` Installation
-:link: install
+:link: install.md
 :link-type: doc
 
-How to install chainladder
+How to install chainladder.
 :::
 
 :::{grid-item-card} {octicon}`beaker;2.5em;sd-mr-1` Tutorials
-:link: tutorials/index
+:link: tutorials/index.md
 :link-type: doc
 
 Our beginner tutorials.
 :::
+
 ::::