Merge pull request #411 from jedireza/nodeschool-sf-hexdex

add nodeschool sf to the hexdex

Author: gangstead

hexdex.html

@@ -119,6 +119,9 @@ <h1 data-i18n="hexdex-h1">Hexdex</h1>
           <a class="imglink" href="https://github.com/nodeschool/hcmc-vietnam" title="Ho Chi Minh City - Vietnam">
             <img class="hex" src="images/nodeschool-hcmc-vietnam.svg" alt="Ho Chi Minh City - Vietnam Hexagon">
           </a>
+          <a class="imglink" href="https://github.com/nodeschool/sanfrancisco/" title="San Francisco">
+            <img class="hex" src="images/nodeschool-sf.svg" alt="San Francsico Hexagon">
+          </a>
           <img class="hex" src="/images/nodeschool-blank.png" alt="blank hexagon" aria-hidden="true">
       </div>
     </div>