Slew of minor style adjustments

- Added padding to bottom of /setup-guide to accomodate iPhone users with curved screen bottoms
- Added screen orientation detection to /player-settings to force select inputs into a single column on mobile devices
- Added an X to the cookie notice to indicate it can be closed
- Changed "Generate Game" to "Start Game" so it matches the header

WebHostLib/static/styles/cookieNotice.css

@@ -9,3 +9,8 @@
     text-align: center;
     cursor: pointer;
 }
+
+#cookie-notice #close-button{
+    float: right;
+    padding-right: 10px;
+}