Fix the update steps (#233)

* Fix the update steps

* Split the docker commands to multiple lines

* Re-add .service

docs/installation.md

@@ -218,14 +218,18 @@ If you use a reverse proxy, you **must** configure invidious to properly serve r
 
 #### Updating a Docker install
 ```bash
-docker-compose pull && docker-compose up && docker image prune -f
+docker-compose pull
+docker-compose up -d
+docker image prune -f
 ```
 
 #### Update a manual install
 ```bash
 sudo - invidious
 cd invidious
-shards update && shards install && crystal build src/invidious.cr --release
+git pull
+shards install --production
+crystal build src/invidious.cr --release
 exit
 systemctl restart invidious.service
 ```