Adding upstream version 5.3.1+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

site/content/docs/5.3/examples/blog-rtl/index.html

@@ -7,7 +7,7 @@ extra_css:
   - "../blog/blog.rtl.css"
 ---
 
-<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
+<svg xmlns="http://www.w3.org/2000/svg" class="d-none">
   <symbol id="aperture" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24">
     <circle cx="12" cy="12" r="10"/>
     <path d="M14.31 8l5.74 9.94M9.69 8h11.48M7.38 12l5.74-9.94M9.69 16L3.95 6.06M14.31 16H2.83m13.79-4l-5.74 9.94"/>
@@ -172,7 +172,7 @@ extra_css:
 
       <nav class="blog-pagination" aria-label="Pagination">
         <a class="btn btn-outline-primary rounded-pill" href="#">تدوينات أقدم</a>
-        <a class="btn btn-outline-secondary rounded-pill disabled">تدوينات أحدث</a>
+        <a class="btn btn-outline-secondary rounded-pill disabled" aria-disabled="true">تدوينات أحدث</a>
       </nav>
 
     </div>