link to Editor, API and GitHub in attribution

src/c3nav/site/static/site/css/c3nav.css

@@ -436,7 +436,7 @@ main:not([data-view=route-result]) #route-dots {
     color: #b2b2b2;
 }
 
-#popup-buttons {
+#popup-buttons, #attributions {
     display: none;
 }
 .location-popup .leaflet-popup-content {

src/c3nav/site/static/site/js/c3nav.js

@@ -787,6 +787,7 @@ c3nav = {
             zoomSnap: 0,
             zoomControl: false
         });
+        c3nav.map.attributionControl.setPrefix($('#attributions').html());
         if (L.Browser.chrome && !('ontouchstart' in window)) {
             $('.leaflet-touch').removeClass('leaflet-touch');
         }

src/c3nav/site/templates/site/map.html

@@ -5,6 +5,11 @@
 
 {% block content %}
     <main class="map" data-state="{{ state }}"{% if embed %} data-embed{% endif %}>
+        <section id="attributions">
+            <a href="{% url 'editor.index' %}" target="_blank">{% trans 'Editor' %}</a> //
+            <a href="/api/" target="_blank">{% trans 'API' %}</a> //
+            <a href="https://github.com/c3nav/c3nav/" rel="external" target="_blank">{% trans 'GitHub' %}</a>
+        </section>
         <section id="map" data-bounds="{{ bounds }}" data-levels="{{ levels }}"{% if tile_cache_server %} data-tile-server="{{ tile_cache_server }}"{% endif %}></section>
         {% if not embed %}
             <section id="popup-buttons">