DOCS: Migrated documentation website to Gitbook (#1809)

documentation/functions/global/DOMAIN_ELSEWHERE.md

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+---
+name: DOMAIN_ELSEWHERE
+parameters:
+  - registrar
+  - nameserver_names
+parameter_types:
+  registrar: string
+  nameserver_names: string[]
+---
+
+`DOMAIN_ELSEWHERE()` is a helper macro that lets you easily indicate that
+a domain's zones are managed elsewhere. That is, it permits you easily delegate
+a domain to a hard-coded list of DNS servers.
+
+`DOMAIN_ELSEWHERE` is useful when you control a domain's registrar but not the
+DNS servers. For example, suppose you own a domain but the DNS servers are run
+by someone else, perhaps a SaaS product you've subscribed to or a DNS server
+that is run by your brother-in-law who doesn't trust you with the API keys that
+would let you maintain the domain using DNSControl. You need an easy way to
+point (delegate) the domain at a specific list of DNS servers.
+
+For example these two statements are equivalent:
+
+```javascript
+DOMAIN_ELSEWHERE("example.com", REG_NAMEDOTCOM, ["ns1.foo.com", "ns2.foo.com"]);
+
+// ...is equivalent to...
+
+D("example.com", REG_NAMEDOTCOM,
+    NO_PURGE,
+    NAMESERVER("ns1.foo.com"),
+    NAMESERVER("ns2.foo.com")
+);
+```
+
+{% hint style="info" %}
+**NOTE**: The `NO_PURGE` is used out of abundance of caution but since no
+`DnsProvider()` statements exist, no updates would be performed.
+{% endhint %}