Merge branch 'Update-docs-link' into 'main'

Remove outdated installation docs link from README

See merge request stackspin/stackspin!666

README.md

@@ -7,6 +7,4 @@ a single-node kubernetes cluster.
 > server’s configuration, so please ONLY install Stackspin on a dedicated, clean
 > server.**
 
-Please refer to https://docs.stackspin.net for further details,
-and to [the installation tutorial](docs/installation_instructions.md) for a step
-by step installation tutorial how to install your cluster.
+Our documentation is hosted on [docs.stackspin.net](https://docs.stackspin.net).