You can drag apps from the second page of the launcher to the first one, drag apps from the first page of the launcher to the second one, increase or decrease the number of apps from the first page.
Here's an example:
And another one:
You can even drag all the apps to the second page:
Google now lets you add other Google services: just visit Google Keep, Google Sites, Google Groups, Google Play Music, Webmaster Tools, Patent Search, Google Voice, click the launcher icon and add shortcuts for those services.