Update index.html

Author: StevenClontz

index.html

@@ -45,7 +45,7 @@
       </nav>
 
       <img style="border-radius:0" alt="code4math logo" src="./code4math.svg">
-      <p>Consortium of Digial Ecosystems for Mathematics</p>
+      <p>Consortium of Digital Ecosystems for Mathematics</p>
     </header>
 
     <main>