Prefer "website" to "homepage"

These days, a "home page" is understood to be only "the main web page
of a website" or "landing page", whereas a "website" is "a collection
of web pages and related content" (Wikipedia).

* doc/emacs/emacs.texi (Top):
* doc/emacs/package.texi (Package Menu):
* doc/lispintro/emacs-lisp-intro.texi (Top):
* doc/lispref/elisp.texi (Top):
* doc/lispref/tips.texi (Documentation Tips):
* doc/misc/ede.texi (ede-project):
* doc/misc/efaq-w32.texi (More information):
* doc/misc/gnus-faq.texi (FAQ 5-7):
* doc/misc/gnus.texi (About mairix):
* doc/misc/mairix-el.texi (About):
* doc/misc/reftex.texi (AUCTeX, Imprint):
* lisp/cedet/ede/base.el (ede-project):
* lisp/cedet/ede/system.el (ede-web-browse-home):
* lisp/emacs-lisp/package.el (package-menu-mode-menu)
(package-browse-url):
* lisp/erc/erc-button.el (erc-emacswiki-url):
* lisp/filesets.el (filesets-goto-homepage):
* lisp/net/mairix.el:
* lisp/net/webjump.el (webjump-sample-sites):
* lisp/obsolete/vc-arch.el:
* lisp/progmodes/idlw-shell.el (idlwave-shell-mode):
* lisp/progmodes/idlwave.el (idlwave, idlwave-mode):
* lisp/textmodes/reftex-vars.el (reftex):
Prefer "website" to "home page".

* doc/lispref/tips.texi (Documentation Tips):
Sort the "URL" header comment before "Homepage".

* lisp/emacs-lisp/lisp-mnt.el
(lm-website): Rename from 'lm-homepage'.
(lm-homepage): Make into alias for 'lm-website'.

doc/lispintro/emacs-lisp-intro.texi

@@ -238,7 +238,7 @@ supports it in developing GNU and promoting software freedom.''
 
 @ifset WWW_GNU_ORG
 @html
-<p>The homepage for GNU Emacs is at
+<p>The GNU Emacs website is at
 <a href="/software/emacs/">https://www.gnu.org/software/emacs/</a>.<br>
 To view this manual in other formats, click
 <a href="/software/emacs/manual/eintr.html">here</a>.