bug#80524: [Coreutils webpages] Proposed changes to symlinks

Hello,

You probably know that there are talks to switch the www.gnu.org web
server from Apache to Nginx. The problem is that Nginx doesn't support
.htaccess. So we need to move the redirections that are now in
/coreutils/.htaccess to .symlinks.

The new symlinks are in the attached patch, with the following
differences with .htaccess:

- The coreutils.es.html entry was removed, because symlinks for HTML
files are converted to rewrite directives that work for all languages.

- s/Multi-call-invocation.html/Multi_002dcall-invocation.html/

- The bracket function was enclosed in brackets because rewrite
directives contain regexes. This trick has proven effective for
commonc[+][+] rewriting.

- s/sha2-utilities/sha2-utilities.html/

If you agree but don't have time to apply the patch, I will gladly
do it.

Best,
Thérèse