use statik to bundle assets, add nix-shell/lorri .envrc

.envrc

@@ -0,0 +1,13 @@
+# This configures [direnv](https://direnv.net/) if installed and enabled to
+# automatically enter the nix-shell defined in `shell.nix`,
+# either by using lorri if available, or nix-shell otherwise.
+
+if type lorri &>/dev/null; then
+    eval "$(lorri direnv)"
+else
+    # fall back to using direnv's builtin nix support (blocking)
+    use nix
+fi
+
+# Load private overrides
+[[ -f .envrc.private ]] && source_env .envrc.private