update readme

README.md

@@ -6,17 +6,18 @@ Runs on Node and uses [Hono](https://hono.dev).
 Can be adapted to run on Bun, Cloudflare Workers, or any other serverless platform.
 
 Available as a [Docker image](https://hub.docker.com/r/nzambello/redirector).
+Repository: [nzambello/redirector](https://git.nzambello.dev/nzambello/redirector).
 
 ## Usage
 
-```
+```sh
 yarn install
 REDIRECT_URL=https://nzambello.dev PERMANENT=true yarn start
 ```
 
 Then, open http://localhost:7878/ in your browser.
 
-```
+```sh
 open http://localhost:7878
 ```
 
@@ -29,13 +30,13 @@ It loads configuration from environment variables:
 - `REDIRECT_URL`: (**required**) the url to redirect to
 - `PERMANENT`: if true, it will return a 301 status code, otherwise 302
 
-## Docker example
+### Docker example
 
-```
+```sh
 docker run -p 7878:7878 -e REDIRECT_URL=https://nzambello.dev -e PERMANENT=true nzambello/redirector:latest
 ```
 
-## Docker compose example
+### Docker compose example
 
 ```yaml
 version: "3.8"
@@ -49,3 +50,11 @@ services:
     ports:
       - 7878:7878
 ```
+
+## Development
+
+To update the Docker image:
+
+```sh
+docker buildx build --platform linux/amd64,linux/arm64 -t nzambello/redirector:latest --push .
+```