Document new lava depth in Getting Started

resolves #157

webapp/views/pages/getting-started.ejs

@@ -33,6 +33,21 @@
 <li>A Mob Protection Rune prevents an animal from being killed.</li>
 <li>There is a known issue with animals despawning: see <a href="https://github.com/poikilos/EnlivenMinetest/issues/3">Neutral Mobs Despawn Frequently</a> issue on GitHub.com/EnlivenMinetest to track this issue.</li>
 </ul>
+<h2>Mining</h2>
+<h3>Maximum Mining Depths</h3>
+You must go below the maximum to get the material. Many materials also have a deeper level below which they are more common.
+<table class="table">
+    <thead>
+        <tr>
+        <th>Maximum</th>    <th>Common</th> <th></th>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+        <td>-256</td>       <td></td>       <td>Lava</td>
+        </tr>
+    </tbody>
+</table>
 <h2>Protecting Your Builds and Items</h2>
 <ul>
 <li>Protector blocks protect your area from other players</li>