Restrict data function types, reorder buttons

Checking the Mapbox style spec properties to see whether or not
exponential should be allowed as the property type, defaulting to
categorical which appears to work for either type. Also re-orders zoom
and data function buttons, aligning zoom right if data not supplied.

src/styles/_components.scss

@@ -40,6 +40,7 @@
 
 .maputnik-doc-target:hover .maputnik-doc-popup {
   display: block;
+  text-align: left;
 }
 
 // BUTTON
@@ -112,6 +113,10 @@
     display: inline-block;
     width: 15%;
   }
+
+  .maputnik-input-block-action > div {
+    text-align: right;
+  }
 }
 
 // SPACE HELPER