docs: gateway.md (#8825)

Adds link to relevant pages at docs.ipfs.io

Author: lidel

docs/gateway.md

@@ -2,19 +2,30 @@
 
 An IPFS Gateway acts as a bridge between traditional web browsers and IPFS.
 Through the gateway, users can browse files and websites stored in IPFS as if
-they were stored in a traditional web server.
+they were stored in a traditional web server. 
 
-By default, go-ipfs nodes run a gateway at `http://127.0.0.1:8080/`.
+[More about Gateways](https://docs.ipfs.io/concepts/ipfs-gateway/) and [addressing IPFS on the web](https://docs.ipfs.io/how-to/address-ipfs-on-web/).
 
-We also provide a public gateway at `https://ipfs.io`. If you've ever seen a
-link in the form `https://ipfs.io/ipfs/Qm...`, that's being served from *our*
-gateway.
+### Local gateway
+
+By default, go-ipfs nodes run
+a [path gateway](https://docs.ipfs.io/how-to/address-ipfs-on-web/#path-gateway) at `http://127.0.0.1:8080/`
+and a [subdomain gateway](https://docs.ipfs.io/how-to/address-ipfs-on-web/#subdomain-gateway) at `http://localhost:8080/`
+
+Additional listening addresses and gateway behaviors can be set in the [config](#configuration) file.
+
+### Public gateways
+
+Protocol Labs provides a public gateway at `https://ipfs.io` (path) and `https://dweb.link` (subdomain).
+If you've ever seen a link in the form `https://ipfs.io/ipfs/Qm...`, that's being served from *our* gateway.
+
+There is a list of third-party public gateways provided by the IPFS community at https://ipfs.github.io/public-gateway-checker/
 
 ## Configuration
 
-The gateway's configuration options are (briefly) described in the
+The `Gateway.*` configuration options are (briefly) described in the
 [config](https://github.com/ipfs/go-ipfs/blob/master/docs/config.md#gateway)
-documentation.
+documentation, including a list of common [gateway recipes](https://github.com/ipfs/go-ipfs/blob/master/docs/config.md#gateway-recipes).
 
 ### Debug
 The gateway's log level can be changed with this command:
@@ -40,7 +51,7 @@ for details</sub>
 ## Static Websites
 
 You can use an IPFS gateway to serve static websites at a custom domain using
-[DNSLink](https://dnslink.io). See [Example: IPFS
+[DNSLink](https://docs.ipfs.io/concepts/glossary#dnslink). See [Example: IPFS
 Gateway](https://dnslink.io/#example-ipfs-gateway) for instructions.
 
 ## Filenames