docs: describe current state only, and fill in the stub READMEs

Drop the history and roadmap asides: which services predate the collection's
conventions, the unwired Open Web UI plan, the generic clone-and-troubleshoot
boilerplate. Services that publish ports or set `restart:` now simply say so.

couchbase, openvpn-as and traffmonetizer had two-line READMEs; give them the
ports, variables and storage the root README promises. traffmonetizer reads
${TOKEN} and had no .env.example, so add one.

couchbase/README.md

@@ -1,2 +1,22 @@
-# couchbase-docker-compose
-docker-compose.yml to run couchbase
+# couchbase
+
+[Couchbase Server](https://www.couchbase.com), single node.
+
+Uses `docker-compose.yml`, publishes ports, and sets `restart: unless-stopped`
+and `container_name: db` — unlike the platform-managed services described in
+the [root README](../README.md).
+
+## Networking
+
+| Ports | Purpose |
+| --- | --- |
+| `8091-8097` | Cluster manager, views, query, search, analytics, eventing |
+| `18091-18097` | The same, over TLS |
+| `11207`, `11210` | Data service (TLS, plain) |
+| `11280`, `9123` | Internal services |
+
+The admin console is on `8091`. Complete the first-run setup there.
+
+## Storage
+
+`couchbase_data` at `/opt/couchbase/var` — data, indexes, config, logs.