docs: Rough notes for "services" docs with examples of internal DNS lookups and container ENV (#136)

website/docs/3-concepts/6-services/1-internal-dns.md

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+# Internal DNS
+
+Services can be addressed on the internal WireGuard network by service name, service ID, or a machine-scoped service name:
+
+## Service name
+```
+$ nslookup nats.internal
+Server:         127.0.0.11
+Address:        127.0.0.11#53
+
+Name:   nats.internal
+Address: 10.210.0.2
+Name:   nats.internal
+Address: 10.210.1.2
+```
+
+```
+$ nslookup worker.internal
+Server:         127.0.0.11
+Address:        127.0.0.11#53
+
+Name:   worker.internal
+Address: 10.210.0.3
+Name:   worker.internal
+Address: 10.210.0.4
+Name:   worker.internal
+Address: 10.210.1.3
+Name:   worker.internal
+Address: 10.210.1.4
+```
+
+## Service ID
+```
+$ nslookup 3ecb3a8bbec5fd3f46efb056a934714a.internal
+Server:         127.0.0.11
+Address:        127.0.0.11#53
+
+Name:   3ecb3a8bbec5fd3f46efb056a934714a.internal
+Address: 10.210.0.4
+```
+
+## Machine ID scoped service name
+```
+$ nslookup 0903f0ee483aa97d559eeeaac5e22283.m.nats.internal
+Server:         127.0.0.11
+Address:        127.0.0.11#53
+
+Name:   nats.internal
+Address: 10.210.1.2
+```
+
+```
+$ nslookup 0903f0ee483aa97d559eeeaac5e22283.m.worker.internal
+Server:         127.0.0.11
+Address:        127.0.0.11#53
+
+Name:   worker.internal
+Address: 10.210.1.3
+Name:   worker.internal
+Address: 10.210.1.4
+```

website/docs/3-concepts/6-services/2-container-env.md

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+# Container ENV Variables
+
+- `UNCLOUD_MACHINE_ID`
+  - Machine ID the service container is running on.
+  - Example: `UNCLOUD_MACHINE_ID=0903f0ee483aa97d559eeeaac5e22283`
+- `HOSTNAME`
+  - Service name with unique suffix.
+  - Example: `HOSTNAME=worker-c1zd`

website/docs/3-concepts/6-services/_category_.yaml

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+label: Services
+collapsed: true # keep the category closed by default
+link:
+  type: generated-index