Use more guix.gnu.org.

* build-aux/build-self.scm (make-config.scm): Replace gnu.org/s/guix with guix.gnu.org.
* guix/scripts/publish.scm (render-home-page): Likewise.
* guix/self.scm (make-config.scm): Likewise.

build-aux/build-self.scm

@@ -75,7 +75,7 @@
                           (package-name "GNU Guix")
                           (package-version "0")
                           (bug-report-address "bug-guix@gnu.org")
-                          (home-page-url "https://gnu.org/s/guix"))
+                          (home-page-url "https://guix.gnu.org"))
 
   ;; Hack so that Geiser is not confused.
   (define defmod 'define-module)

guix/scripts/publish.scm

@@ -694,7 +694,7 @@ to compress or decompress the log file; just return it as-is."
                             (h1 "GNU Guix Substitute Server")
                             (p "Hi, "
                                (a (@ (href
-                                      "https://gnu.org/s/guix/manual/html_node/Invoking-guix-publish.html"))
+                                      "https://guix.gnu.org/manual/en/html_node/Invoking-guix-publish.html"))
                                   (tt "guix publish"))
                                " speaking.  Welcome!")))
                          port)))))

guix/self.scm

@@ -916,7 +916,7 @@ Info manual."
                           (package-name "GNU Guix")
                           (package-version "0")
                           (bug-report-address "bug-guix@gnu.org")
-                          (home-page-url "https://gnu.org/s/guix"))
+                          (home-page-url "https://guix.gnu.org"))
 
   ;; Hack so that Geiser is not confused.
   (define defmod 'define-module)