Update links in help section (http -> https, fix dead URLs)

index.html

@@ -322,10 +322,10 @@ <h4 class="t" data-t="help.export.query_data.title"></h4>
             </div>
             <h3 class="t" data-t="help.section.about"></h3>
             <div>
-              <a href="http://overpass-api.de">
+              <a href="https://overpass-api.de">
                 <img
                   style="float: right"
-                  src="//wiki.openstreetmap.org/w/images/b/b3/Powered_by_Overpass_API.png"
+                  src="https://wiki.openstreetmap.org/w/images/b/b3/Powered_by_Overpass_API.png"
                   alt="powered by Overpass API"
               /></a>
               <p class="t" data-t="[html]help.about.maintained"></p>
@@ -342,12 +342,12 @@ <h4 class="t" data-t="help.attr.data_sources"></h4>
                 <li class="t" data-t="[html]help.attr.data"></li>
                 <li>
                   <span class="t" data-t="help.attr.mining"></span>
-                  <a href="http://overpass-api.de/">Overpass API</a>
+                  <a href="https://overpass-api.de/">Overpass API</a>
                 </li>
                 <li class="t" data-t="[html]help.attr.tiles"></li>
                 <li>
                   <span class="t" data-t="help.attr.search"></span>
-                  <a href="http://wiki.openstreetmap.org/wiki/Nominatim"
+                  <a href="https://wiki.openstreetmap.org/wiki/Nominatim"
                     >Nominatim</a
                   >
                 </li>
@@ -356,11 +356,11 @@ <h4 class="t" data-t="help.attr.software"></h4>
               <ul class="plain">
                 <li>
                   <span class="t" data-t="help.attr.leaflet"></span>
-                  <a href="http://leaflet.cloudmade.com">Leaflet</a>
+                  <a href="https://leafletjs.com/">Leaflet</a>
                 </li>
                 <li>
                   <span class="t" data-t="help.attr.codemirror"></span>
-                  <a href="http://codemirror.net/">CodeMirror</a>
+                  <a href="https://codemirror.net/">CodeMirror</a>
                 </li>
                 <li>
                   <span class="t" data-t="help.attr.other_libs"></span>
@@ -1110,13 +1110,13 @@ <h3 class="t subtitle" data-t="share.options"></h3>
             running (significant parts of) this Application.
             <small>
               It must support
-              <a href="http://en.wikipedia.org/wiki/Web_storage#localStorage">
+              <a href="https://en.wikipedia.org/wiki/Web_storage#localStorage">
                 Web Storage API
               </a>
 
               and
               <a
-                href="http://en.wikipedia.org/wiki/Cross-origin_resource_sharing"
+                href="https://en.wikipedia.org/wiki/Cross-origin_resource_sharing"
               >
                 cross origin resource sharing (CORS)
               </a>
@@ -1130,11 +1130,11 @@ <h3 class="t subtitle" data-t="share.options"></h3>
           <p class="t" data-t="[html]warning.browser.expl.3">
             Please upgrade to a more up-to-date version of your browser or
             switch to a more capable one! Recent versions of
-            <a href="http://www.opera.com">Opera</a>,
-            <a href="http://www.google.com/intl/de/chrome/browser/">Chrome</a>
-            and <a href="http://www.mozilla.org/de/firefox/">Firefox</a> have
+            <a href="https://www.opera.com">Opera</a>,
+            <a href="https://www.google.com/chrome/">Chrome</a>
+            and <a href="https://www.mozilla.org/firefox/">Firefox</a> have
             been tested to work. Alternatively, you can still use the
-            <a href="http://overpass-api.de/query_form.html">
+            <a href="https://overpass-api.de/query_form.html">
               Overpass_API query form
             </a>
             .