Remove non-working code and explain why.

I prefer to remove this code than leaving it there when it does not
work. The removal reason and the actual problem are better documented in
the Known Issues section of the README so other developers get it easier
to work on it.

website_mail_snippet_responsive/README.rst

@@ -51,6 +51,17 @@ Known issues / Roadmap
   will insert a ``<br type="_moz"/>`` in Firefox, that will make it seem like
   its height is at least like a caret, even if you set a lower value. Do not
   worry, it goes away when you press *Save*.
+* Some elements do not render with the proper width in MS Outlook. This should
+  be added inside each snippet to make them work::
+
+      <!--[if gte mso]>
+          <style type="text/css">
+          .fluid { width: 600px !important; }
+          </style>
+      <![endif]-->
+
+  But right now the view parser eats comments, and if you avoid that then
+  CKEditor will eat them, so there's not an easy solution for now.
 
 Bug Tracker
 ===========

website_mail_snippet_responsive/views/templates.xml

@@ -18,11 +18,6 @@
         <div
             class="oe_snippet_body"
             style="padding:0px; width:100%; background-color:#ececec; color:rgb(0,0,0); line-height:20px; font-family:Arial,sans-serif; font-size:9pt">
-            <!--[if gte mso]>
-                <style type="text/css">
-                .fluid { width: 600px !important; }
-                </style>
-            <![endif]-->
             <table class="fluid" align="center" cellpadding="0" cellspacing="0" style="max-width: 600px; border-collapse: collapse; background: inherit; color: inherit;">
                 <tbody>
                     <tr>