Remove stable parameter from installation guide (#4608)

We recently introduced changes to docker compose file. This was creating a discrepancy between the docker file (on develop branch) and the demo docker images (on stable). Thus the command invoke demo.start wasn't working anymore from develop branch. This has been solved with the newest release.

docs/docs/guides/installation.mdx

@@ -64,7 +64,7 @@ cd ~/source/infrahub/
 Next, clone the Infrahub GitHub repository into the current directory.
 
 ```shell
-git clone --recursive -b stable --depth 1 https://github.com/opsmill/infrahub.git
+git clone --recursive --depth 1 https://github.com/opsmill/infrahub.git
 ```
 
 :::note