Update company name in footer copyright (#195)

Author: eric-schneider

src/partials/footer.hbs

@@ -12,7 +12,7 @@
     <p class="!m-0">
       <span>©</span>
       <span id="copyrightdate">{{year}}</span>
-      <span>DataStax |
+      <span>DataStax, an IBM Company |
         <a
           href="https://www.datastax.com/legal/datastax-website-privacy-policy"
           target="_blank"