added documentation section and split html into partials

src/templates/partials/footer.html

@@ -0,0 +1,18 @@
+<div class="botbar">
+    <p xmlns:cc="http://creativecommons.org/ns#" xmlns:dct="http://purl.org/dc/terms/"><a property="dct:title"
+            rel="cc:attributionURL" href="https://netig.net">NETig website</a> by <span
+            property="cc:attributionName">Julien Debrousse</span> is licensed under <a
+            href="https://creativecommons.org/licenses/by/4.0/?ref=chooser-v1" target="_blank"
+            rel="license noopener noreferrer" style="display:inline-block;">CC BY 4.0<img
+                style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+                src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1" alt=""><img
+                style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
+                src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1" alt=""></a></p>
+    <p>
+        <a href="/legal">Mentions Légales</a>
+    </p>
+    <p>
+        Made with ❤️ with <a href="https://www.getzola.org/" target="_blank">Zola</a> !
+    </p>
+</div>
+<script src="{{ get_url(path="js/sidenav.js") }}"></script>