[Fortran,wwwdocs] readings.html - updates to www.fortran.org

[Gerald Pfeifer]

www.fortran.org made a number of changes to their site which now
defaults to https, does not carry the FORTRAN 77 Standard any more
(that I could find it), and removed some other material.

This updates readings.html accordingly, and also streamlines the 
Fortran section there a bit to reduce those lists with just one item.

Committed.

Gerald

Find a new reference for the FORTRAN 77 standard; streamline the structure
of Fortran related material a bit.  Remove an obsolete generic linke to
www.fortran.org and update another one to https.

Index: readings.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v
retrieving revision 1.313
diff -u -r1.313 readings.html
--- readings.html	27 May 2019 09:06:30 -0000	1.313
+++ readings.html	11 Jun 2019 06:03:17 -0000
@@ -415,18 +415,10 @@
     <li><a href="https://j3-fortran.org">Fortran standards committee</a>
     (includes references to the current draft of the Fortran standard)</li>
 
-  </ul></li>
-
-  <li>Fortran historical information:
-
-  <ul>
-
-    <li><a href="http://www.fortran.com/F77_std/rjcnf.html">FORTRAN 77 Standard</a></li>
+    <li><a href="https://wg5-fortran.org/ARCHIVE/Fortran77.html">FORTRAN 77 Standard</a></li>
 
   </ul></li>
 
-  <li><a href="http://www.fortran.com/info.html">Fortran FAQs, books and software</a></li>
-
   <li>Testing and Validation -
       Some packages aimed at Fortran compiler validation.
     <ul>
@@ -498,7 +490,7 @@
        Books with source code: 
        <ul>
          <li>
-           <a href="http://www.fortran.com/F/books.html">Examples</a> of
+           <a href="https://www.fortran.com/F/books.html">Examples</a> of
            <cite>Essential Fortran 90 & 95</cite> by Loren Meissner.
          </li>
        </ul>