Google Sites offers the ability to make minor adjustments to the links that are displayed in the system footer.  Some text/links, such as "Powered by Google Sites", cannot be removed.  The following links, however, can be hidden:

• View Site as Desktop for mobile enabled sites - This option controls whether the link appears to visitors who are viewing your site on a mobile device.
  
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How to Customize the Google Sites System Footer Links

1. Log into the site as an Owner
2. Navigate to More Actions > Manage Site > Site Layout
3. Scroll to the bottom and click the Customize System Footer Links link
   
   
   
   
4. Select the options to hide/display
   
   
5. Click OK
6. Save changes