Add some links to come back to the main page

evaluate.html

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             <h1>Crossroad segmentation quality evaluation</h1>
-             <p class="lead">By answering the following questions, you will evaluate the quality of a junction detection and segmentation algorithm in <a href="https://www.openstreetmap.org/">OpenStreetMap</a>, and participate in the <a href="https://activmap.limos.fr/">ANR ACTIVmap project</a>.
+             <p class="lead">By answering the following questions, you will evaluate the quality of a junction detection and segmentation algorithm in <a href="https://www.openstreetmap.org/">OpenStreetMap</a>, and participate in the <a href="https://activmap.limos.fr/">ANR ACTIVmap project</a>. This tool is part of the <a href="index.html">main evaluation toolkit</a>.</p>
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                  <div class="position-absolute top-50 start-50 translate-middle fs-1">
                         <p>Download <code>json</code> file</p>
                         <button id="download_end" class="btn btn-primary" type="button" style="width: 100%">Get evaluations</button>
+                        <p>Come back to the <a href="index.html">main evaluation page</a>.</p>
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