landing page: set focus on search field

Also updates the CSS to reduce the "focus highlight" applied
by browsers.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

_includes/body-landing.html

@@ -71,6 +71,7 @@
           autocomplete="off"
           spellcheck="false"
           dir="auto"
+          autofocus
         />
       </form>
     </div>

_scss/_landing.scss

@@ -105,6 +105,11 @@ body#landing {
       height: 50px;
       line-height: 24px;
       padding: 13px 20px;
+
+      &:focus {
+        box-shadow: none;
+        outline: none;
+      }
     }
   }