✨ feat: Add auth flow (#146)

This adds a simple way to incorporate a centralized authentication flow.

The idea is to have the user, API and SSH (for machine authentication)
all in one place using `openauthjs` + `SST`

We also have a database now :)

> We are using InstantDB as it allows us to authenticate a use with just
the email. Plus it is super simple simple to use _of course after the
initial fumbles trying to design the db and relationships_

infra/dns.ts

@@ -0,0 +1,9 @@
+export const domain =
+  {
+    production: "prod.nestri.io", //temporary use until we go into the real production
+    dev: "dev.nestri.io",
+  }[$app.stage] || $app.stage + ".dev.nestri.io";
+
+  export const zone = cloudflare.getZoneOutput({
+    name: "nestri.io",
+  });