fix: invoke kill-buffer after org-id-goto to avoid Fundamental buffers

If we don't kill the buffer after org-id-goto, and then the
`org-id-goto' will then goto the previous buffer we openned. The
buffer's major mode will be Fundamental.

ox-hugo.el

@@ -2371,6 +2371,7 @@ and rewrite link paths to make blogging more seamless."
   (with-temp-buffer
     (org-id-goto (org-element-property :path link))
     (let ((headline (org-find-top-headline)))
+      (kill-buffer (current-buffer))
       (if headline
           (org-hugo-slug headline)
         ""))))