Fix lots of broken links

template/page-impact.html.jinja

@@ -47,7 +47,7 @@
   <section class="container-new py-26">
     <div class="col-md-6 offset-md-3 p-10-until-sm pl-0-sm pr-0-sm">
       <h2 class="h4 h2-sm mb-8">{% trans %}Creating Economic Opportunity{% endtrans %}</h2>
-      <h5 class="longform mb-10">{% trans %}For more than <a href="https://www.un.org/sites/un2.un.org/files/wmr_2020.pdf" target="_blank">272 million migrants</a> worldwide, sending and receiving money across borders is expensive, unreliable and complex.{% endtrans %}</h5>
+      <h5 class="longform mb-10">{% trans %}For more than <a href="https://publications.iom.int/system/files/pdf/wmr_2020.pdf" target="_blank">272 million migrants</a> worldwide, sending and receiving money across borders is expensive, unreliable and complex.{% endtrans %}</h5>
       <p class="mb-6">{% trans %}XRP and the XRP Ledger are changing that. The technology has been adopted by financial institutions around the world to source liquidity for international transactions. Because of the unprecedented efficiency it offers, they’re able to bring down costs and improve services.{% endtrans %}</p>
       <p class="mb-0">{% trans %}This means hundreds of millions of people worldwide who need to move money safely and securely across borders can do so more affordably and reliably than ever before.{% endtrans %}</p>
     </div>

template/page-xrp-overview.html.jinja

@@ -161,9 +161,6 @@
               "id": "wallet-ledger",
               "alt": _("Ledger"),
               "imgclasses": "invertible-img" },
-            { "href": "https://www.secalot.com/",
-              "id": "wallet-secalot",
-              "alt": _("Secalot") },
             { "href": "https://trezor.io/",
               "id": "wallet-trezor",
               "alt": _("Trezor"),