update doc link:

Author: moustakas

py/SGA/webapp/templates/explore.html

@@ -13,10 +13,10 @@ <h2><a href="https://sga.legacysurvey.org"</a>Siena Galaxy Atlas 2020</h2>
   <p>Welcome to the data portal for the SGA-2020!</p>
 
   <p>Please refer to
-  the <a href="https://portal.nersc.gov/project/cosmo/temp/ioannis/sga-dr9/sga/sga2020">SGA-2020
+  the <a href="https://www.legacysurvey.org/sga/sga2020">SGA-2020
   documentation</a> (or click on the SGA dropdown menu) for full details
   regarding this data release and
-  the <a href="https://portal.nersc.gov/project/cosmo/temp/ioannis/sga-dr9/sga/sga2020#acknowledgments">required
+  the <a href="https://www.legacysurvey.org/sga/sga2020#acknowledgments">required
   acknowledgments and conditions of use</a>.</p> 
 
   <img style="width: 400px;" src="{% static "files/sga-2020-sky.png" %}" alt="SGA-2020 sky"/>