org: disable postamble in html export

* doc/org/init.el.in, doc/org/.dir-locals.el.in: Here.

doc/org/.dir-locals.el.in

@@ -32,6 +32,7 @@
 	      (org-babel-python-command . "@PYTHON@")
 	      (org-babel-C++-compiler . "./g++wrap")
 	      (shell-file-name . "@SHELL@")
+              (org-export-html-postamble . nil)
 	      (org-publish-project-alist
 	       . (("spot-html"
 		   :base-directory "."

doc/org/init.el.in

@@ -52,6 +52,8 @@
  <a accesskey=\"h\" href=\"%s\">UP</a> | <a accesskey=\"H\" href=\"%s\">HOME</a>
 </div>")
 
+(setq org-export-html-postamble nil)
+
 (setq org-publish-project-alist
       `(("spot-html"
 	:base-directory "@abs_top_srcdir@/doc/org/"