feat(org): add Kagi custom link type

modules/lang/org/README.org

@@ -234,6 +234,7 @@ They are (with examples):
 - ~github:hlissner/doom-emacs~
 - ~gmap:Toronto, Ontario~ (Google Maps)
 - ~google:search terms~
+- ~kagi:search terms~
 - ~org:todo.org~ -> ={org-directory}/%s=
 - ~wolfram:sin(x^3)~
 - ~wikipedia:Emacs~

modules/lang/org/config.el

@@ -519,6 +519,7 @@ relative to `org-directory', unless it is an absolute path."
             '("google"      . "https://google.com/search?q=")
             '("gimages"     . "https://google.com/images?q=%s")
             '("gmap"        . "https://maps.google.com/maps?q=%s")
+            '("kagi"        . "https://kagi.com/search?q=%s")
             '("duckduckgo"  . "https://duckduckgo.com/?q=%s")
             '("wikipedia"   . "https://en.wikipedia.org/wiki/%s")
             '("wolfram"     . "https://wolframalpha.com/input/?i=%s")