Add grafana link, drop ci link

Grafana is the new observability UI. The ci/service-manager middleman
is being decommissioned in favor of direct Tailscale SSH deploys, so
the link is no longer useful.

src/ajet/www/core.clj

@@ -32,7 +32,7 @@
                  [:li [:a {:href "https://git.ajet.fyi/explore/repos"}      "repos"]]
                  [:li [:a {:href "https://ebooks.ajet.fyi"}                 "ebooks"]]
                  [:li [:a {:href "https://uptime.ajet.fyi"}                 "uptime"]]
-                 [:li [:a {:href "https://ci/"}                             "ci"]]
+                 [:li [:a {:href "https://grafana.ajet.fyi"}                "grafana"]]
                  [:li [:a {:href "https://mini:8006"}                       "cluster"]]
                  [:li [:a {:href "http://192.168.1.124:8081"}               "mp4"]]
                  [:li [:a {:href "http://24.97.151.11/aca/index.html#view"} "upstate live feed"]]]