feat(motd): add the ability to display motd and dimiss information panels (#2191)

* feat(api): add motd handler

* feat(app): add the motd api layer

* feat(motd): display motd and add the ability to dismiss information messages

* style(home): relocate important message before info01

* feat(api): silently fail when an error occurs during motd retrieval

api/http/handler/motd/handler.go

@@ -0,0 +1,24 @@
+package motd
+
+import (
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/portainer/portainer/http/security"
+)
+
+// Handler is the HTTP handler used to handle MOTD operations.
+type Handler struct {
+	*mux.Router
+}
+
+// NewHandler returns a new Handler
+func NewHandler(bouncer *security.RequestBouncer) *Handler {
+	h := &Handler{
+		Router: mux.NewRouter(),
+	}
+	h.Handle("/motd",
+		bouncer.AuthenticatedAccess(http.HandlerFunc(h.motd))).Methods(http.MethodGet)
+
+	return h
+}