[Website] Update broken links and old ones

- Fix broken Ericsson image link
- Fix old http to new https adresses

Change-Id: I06deaeb383bfa23d1d6da5a6dcd8c9a74751a36f
Signed-off-by: Quentin Le Menez <quentin.lemenez@cea.fr>
diff --git a/download.html b/download.html
index 23495fa..96e0fe2 100644
--- a/download.html
+++ b/download.html
@@ -219,7 +219,7 @@
                             <p class="text-justify"><b>Master</b></p>
 
                             <ul class="text-justify">
-                                <li><a href="http://download.eclipse.org/modeling/mdt/papyrus/updates/nightly/master">http://download.eclipse.org/modeling/mdt/papyrus/updates/nightly/master</a></li>
+                                <li><a href="https://download.eclipse.org/modeling/mdt/papyrus/updates/nightly/master">https://download.eclipse.org/modeling/mdt/papyrus/updates/nightly/master</a></li>
                             </ul>
                         </div>
                     </div>
@@ -239,7 +239,7 @@
                             <p class="text-justify"><b>Eclipse Papyrus 2020-06 (4.8.X)</b></p>
                             
                             <ul class="text-justify">
-                                <li><a href="http://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-06">http://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-06</a></li>
+                                <li><a href="https://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-06">https://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-06</a></li>
                             </ul>
                         </div>
                     </div>
@@ -258,7 +258,7 @@
                             <p class="text-justify"><b>Eclipse Papyrus 2020-03 (4.7.X)</b></p>
                             
                             <ul class="text-justify">
-                                <li><a href="http://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-03">http://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-03</a></li>
+                                <li><a href="https://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-03">https://download.eclipse.org/modeling/mdt/papyrus/updates/releases/2020-03</a></li>
                             </ul>
                             
                             <p class="text-justify"><b>Eclipse Papyrus 2019-12 (4.6.X)</b></p>
diff --git a/testimonials.html b/testimonials.html
index 0e1681a..a828be3 100755
--- a/testimonials.html
+++ b/testimonials.html
@@ -177,7 +177,7 @@
 				<div class="col-md-6">
                     <div class="panel panel-default">
                         <div class="panel-body">
-                            <a href="http://www.ericsson.com/res/thecompany/docs/publications/ericsson_review/2015/er-network-modeling.pdf" target="_blank">
+                            <a href="https://www.eclipsecon.org/europe2014/sites/default/files/slides/Ericsson_NWADSL_at_EclipseCon_Europe2014_0.pdf" target="_blank">
                                 <img class="img-responsive center-block" src="resources/ericsson-usecasestory.png" alt="Ericsson Use Case Story">
                             </a>
                             <h2>&quot;<b>Design, architects, and complex communication systems: painting the bigger picture</b>&quot; <br>Ericsson</h2>