maintaining.html: Add link to Alex's website

srcfix: I also fixed a mix of tabs and spaces to be spaces only
(the predominant indentation).

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/maintaining.html b/maintaining.html
index 25cb8cd..a54c41f 100644
--- a/maintaining.html
+++ b/maintaining.html
@@ -47,9 +47,10 @@
         <a href="https://man7.org/mtk/">Michael Kerrisk</a>
         (<span class="email">mtk.manpages@gmail.com</span>;
         <a href="https://blog.man7.org/">blog</a>);
-	starting in 2020, Alejandro Colomar
+        starting in 2020,
+        <a href="http://www.alejandro-colomar.es/">Alejandro Colomar</a>
         (<span class="email">alx.manpages@gmail.com</span>)
-	has joined as comaintainer.
+        has joined as comaintainer.
     </p>
     <p>
         This page provides