update header project list accessibility

Created by: flora8984461

According to https://github.com/EclipseFdn/solstice-assets/issues/221#issuecomment-761183342

Signed-off-by: Yi Liu yi.liu@eclipse-foundation.org

docs/index.html

@@ -177,6 +177,21 @@
<div class="col-md-20 col-md-offset-2 col-sm-18 col-sm-offset-3">
<h1> How to use the Eclipse Solstice theme</h1>
<p>The Eclipse Foundation provides our global community of individuals and organizations with a mature, scalable, and business-friendly environment for open source software collaboration and innovation.</p>
+
+
+              <div class="row">
+                <div class="col-sm-offset-8 col-sm-8">
+                  <form id="form-discover-search" class="form-inline form-search-projects custom-search-form margin-bottom-10" role="form" action="https://projects.eclipse.org/">
+                    <div class="input-group">
+                      <input id="discover-search-box" type="text" size="25" name="combine" class="form-control text-center" placeholder="Search projects">
+                      <span class="input-group-btn">
+                        <button class="btn btn-primary" aria-label="Search Projects" type="submit"><i class="fa fa-search" aria-hidden="true"></i></button>
+                      </span>
+                    </div><!-- /input-group -->
+                  </form>
+
+              <a href="https://projects.eclipse.org/">View All Projects</a>
+
</div>
</div>
</div>