add disclaimer to datasets page

apps/greencheck/templates/green_url.html

@@ -12,6 +12,12 @@ <h1>Download Green Domain dataset snapshots</h1>
 <p>If you need the full dataset, you can download the compressed versions of the <em>Green Domain</em> dataset at the link below.</p>
 
 <p>For more information on these datasets, or for data going further back, please visit our <a href="https://www.thegreenwebfoundation.org/green-web-datasets/">datasets</a> page on the main website.</p>
+
+<h2>Disclaimer</h2>
+
+<p>Our datasets are provided on a best efforts basis. While we make every effort to ensure that snapshots are generated on a daily basis, we make no guarantees about their availability.</p>
+<p>If you require these datasets for commercial purposes and would like to arrange a Service Level Agreement (SLA) then please <a href="https://www.thegreenwebfoundation.org/services/">contact us about setting up a commercial agreement</a>.</p>
+
 </div>
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