feat(grfn/emacs): Configure notmuch popup window rules

I want notmuch to open in a full window, not as a bottom-of-the-screen
popup.

Change-Id: If539ff315fabae94d5a849c526c4322f9bdf8c61
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3024
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/emacs.d/email.el

@@ -26,3 +26,11 @@
           (:name "personal" :query "tag:inbox and tag:important and path:personal/**"
                  :key "p"))
         message-send-mail-function 'message-send-mail-with-sendmail)
+
+(set-popup-rule! "^\\*notmuch-saved-search-"
+  :ignore t)
+
+(set-popup-rule! (lambda (_ action)
+                   (eq (car action)
+                       'display-buffer-same-window))
+  :ignore t)