Update install instructions for COPR

goncalossilva/cli has been up and running for much longer than the current recommendation, and over the years, it's been more reliable with its builds.

See:
- https://github.com/goncalossilva/rpm-act/actions
- https://copr.fedorainfracloud.org/coprs/goncalossilva/act/monitor/

It's also fully automated. This means stable versions of Fedora get new builds quickly (even if builds on rawhide/preview versions tend to fail while the dust settles).

src/installation/copr.md

@@ -1,8 +1,8 @@
-# [COPR](https://copr.fedorainfracloud.org/coprs/rubemlrm/act-cli/) (Linux)
+# [COPR](https://copr.fedorainfracloud.org/coprs/goncalossilva/act/) (Linux)
 
 [![Copr build status](https://copr.fedorainfracloud.org/coprs/rubemlrm/act-cli/package/act-cli/status_image/last_build.png)](https://copr.fedorainfracloud.org/coprs/rubemlrm/act-cli/package/act-cli/)
 
 ```shell
-dnf copr enable rubemlrm/act-cli
+dnf copr enable goncalossilva/act
 dnf install act-cli
 ```