index.html: Add links

Author: mkoeppe

index.html

@@ -11,8 +11,11 @@ <h1 style="font-size: 5.9vw";>
            style="display: inline-block; top: 0; left: 0; width:100%;">
         <image width="1275" height="1754" xlink:href="art/Z12_128-150dpi.png">
         </image>
-        <a xlink:href="https://github.com/passagemath/passagemath" xlink:title="passagemath"><rect x=105 y=59 class="maplink" width=1060 height=219 /> </a>
-        <a xlink:href="docs/10.6" xlink:title="documentation"><rect x=158 y=1227 class="maplink" width=529 height=140 /> </a>
+        <a xlink:href="https://github.com/passagemath/passagemath" xlink:title="passagemath">
+          <text x="637" y="170" text-anchor="middle">GitHub repository</text>
+        </a>
+        <a xlink:href="docs/10.6" xlink:title="documentation">
+          <text x="425" y="1290" text-anchor="middle">documentation 12.6</text>
       </svg>
     </div>
     <div style="position: absolute; top: 8px; left: 16px; ">passagemath</div>