DOCS: Migrated documentation website to Gitbook (#1809)

documentation/providers/linode.md

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+## Configuration
+
+To use this provider, add an entry to `creds.json` with `TYPE` set to `LINODE`
+along with your [Linode Personal Access Token](https://cloud.linode.com/profile/tokens).
+
+Example:
+
+```json
+{
+  "linode": {
+    "TYPE": "LINODE",
+    "token": "your-linode-personal-access-token"
+  }
+}
+```
+
+## Metadata
+This provider does not recognize any special metadata fields unique to Linode.
+
+## Usage
+An example `dnsconfig.js` configuration:
+
+```javascript
+var REG_NONE = NewRegistrar("none");
+var DSP_LINODE = NewDnsProvider("linode");
+
+D("example.tld", REG_NONE, DnsProvider(DSP_LINODE),
+    A("test", "1.2.3.4")
+);
+```
+
+## Activation
+[Create Personal Access Token](https://cloud.linode.com/profile/tokens)
+
+## Caveats
+Linode does not allow all TTLs, but only a specific subset of TTLs. The following TTLs are supported
+([source](https://github.com/linode/manager/blob/master/src/domains/components/SelectDNSSeconds.js)):
+
+- 300
+- 3600
+- 7200
+- 14400
+- 28800
+- 57600
+- 86400
+- 172800
+- 345600
+- 604800
+- 1209600
+- 2419200
+
+The provider will automatically round up your TTL to one of these values. For example, 600 seconds would become 3600
+seconds, but 300 seconds would stay 300 seconds.