feat(web/panettone): Redirect to original URI after login

Once the user authenticates, redirect them to the original URI they were
trying to get to

Fixes: #7
Change-Id: Id7c8cbe3547923f6c4c5faed180ea8ea6528fddd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1411
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>

web/panettone/default.nix

@@ -6,6 +6,7 @@ depot.nix.buildLisp.program {
   deps = with depot.third_party.lisp; [
     cl-prevalence
     cl-who
+    drakma
     defclass-std
     easy-routes
     hunchentoot