refactor: new dev/prod containers

- Use a single Dockerfile for all Zeppelin services
- Add a Dockerfile in project root that can be used by
  app hosting services
- Provide a standalone and lightweight prod setup
  - Standalone is the same as the old setup, with mysql+nginx
  - Lightweight only runs bot+backend+dash, no mysql/nginx
- Remove mounted mysql data folders for dev and prod
  - This resolves permission issues caused by the mount
  - The mysql service uses a regular named volume now
- Simplify .env options and clearly separate different prod setups
- Remove update.sh
  - Different setups require different update procedures, so a common
    update.sh no longer works

dashboard/serve.js

@@ -0,0 +1,14 @@
+const fastify = require("fastify")({ logger: true });
+const fastifyStatic = require("@fastify/static");
+const path = require("path");
+
+fastify.register(fastifyStatic, {
+  root: path.join(__dirname, "dist"),
+});
+
+fastify.listen({ port: 3002, host: '0.0.0.0' }, (err, address) => {
+  if (err) {
+    throw err;
+  }
+  console.log(`Server listening on ${address}`);
+});