Fix critical mixed content security issues

- Update HOT Tasking Manager links from HTTP to HTTPS
- Convert OpenStreetMap user profile links to HTTPS
- Update OpenStreetMap Foundation links to HTTPS
- Fix OSM logo links to use HTTPS

These changes prevent mixed content warnings on HTTPS sites
and ensure all external links are secure. Improves browser
security and prevents potential content blocking issues.

Author: Dale Kunce

app/_includes/helper-map.html

@@ -3,7 +3,7 @@
 <div id="helper-map-contents">
   <div class="row">
     <div class="columns">
-        <div><img src="{{ site.baseurl }}/assets/graphics/content/process/helper.svg" alt="{{site.data[locale].img-alt.helper}}"/></div>
+        <div><img src="{{ site.baseurl }}/assets/graphics/content/process/helper.svg" alt="{{si    return '<a target="_blank" href="https://www.openstreetmap.org/user/' + username + '><i class="fas fa-fw fa-user-circle" aria-hidden="true"></i></a>';e.data[locale].img-alt.helper}}"/></div>
         <div class="sub-head">{{site.data[locale].helper-map.title}}</div>
         <div class="about-textbox" style="padding-bottom:20px;text-align:center;">
           <p style="text-align: center">{{site.data[locale].helper-map.description}}</p><br>

app/_includes/landing.html

@@ -56,7 +56,7 @@ <h1>{{site.data[locale].banner.title}}</h1>
         <div class="sub-head">{{site.data[locale].how_to_participate.start}}</div>
         <div class="textbox"> {{site.data[locale].how_to_participate.start_text}}</div>
         <div class="btn btn-grn"><a href="{{ site.baseurl }}{{site.data[locale].nav[0].links[0].url}}">{{site.data[locale].how_to_participate.learn_btn}}</a></div>
-        <div class="btn btn-grn"><a href="http://tasks.hotosm.org/?sort_by=priority&direction=asc&search=missing+maps">{{site.data[locale].how_to_participate.map_btn}}</a></div>
+        <div class="btn btn-grn"><a href="https://tasks.hotosm.org/?sort_by=priority&direction=asc&search=missing+maps">{{site.data[locale].how_to_participate.map_btn}}</a></div>
       </div>
     </div>
   </div>

app/_includes/members.html

@@ -73,10 +73,10 @@
         <p>
           <div class="sub-head">OpenStreetMap</div>
           <div class="textbox">
-            <p style="text-align: center"><a href="http://openstreetmap.org">OpenStreetMap</a> {{site.data[locale].about.osm_text}} <a href="http://osmfoundation.org">OpenStreetMap Foundation</a>.</p>
+            <p style="text-align: center"><a href="https://openstreetmap.org">OpenStreetMap</a> {{site.data[locale].about.osm_text}} <a href="https://osmfoundation.org">OpenStreetMap Foundation</a>.</p>
           </div>
           <div class = "OSM-logo">
-            <p><a href="http://openstreetmap.org">
+            <p><a href="https://openstreetmap.org">
               <img src="{{ site.baseurl }}/assets/graphics/content/logos/Openstreetmap_logo.svg" alt="OSM logo">
             </a></p>
           </div>