chore(docs): adds docs for hostname label

docs/guide/hostname.md

@@ -0,0 +1,30 @@
+---
+title: Hostname
+---
+
+# Changing Dozzle's Hostname
+
+Dozzle's default connection is called localhost. Using `--hostname` flag Dozzle's name can be changed to anything. This value be will shown on the page title and under the Dozzle logo.
+
+Changing the label for localhost also changes the label for the `localhost` connection which is displayed under the multi-host menu. Below is an example of using `--hostname` to change the name of Dozzle's subheader to `mywebsite.xyz`.
+
+::: code-group
+
+```sh
+docker run --volume=/var/run/docker.sock:/var/run/docker.sock -p 8080:8080 amir20/dozzle --hostname mywebsite.xyz
+```
+
+```yaml [docker-compose.yml]
+version: "3"
+services:
+  dozzle:
+    image: amir20/dozzle:latest
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    ports:
+      - 8080:8080
+    environment:
+      DOZZLE_HOSTNAME: mywebsite.xyz
+```
+
+:::