Add an .htaccess symlink to the toplevel of the irc-logs directory.

This allows redirection configuration (for old links) and access control
be done directly in the irc-logs directory.

pkgs/plt-services/meta/web/www/irc.rkt

@@ -28,6 +28,7 @@
       (hash-ref! t type (λ() (a href: (symlink (format "~a/~a" base type)
                                                (format "irc-logs/~a" type))
                                 text))))))
+(void (irc-logs ".htaccess"))
 
 (provide irc-quick)
 (define (irc-quick)