incrementing porch latest version + README redirect to new documentation (#450)

Author: Catalin-Stratulat-Ericsson

README.md

@@ -10,4 +10,4 @@ project as of December 2023.
 
 ## Documentation
 
-Documentation of Porch is available in the [Nephio documentation page](https://docs.nephio.org/docs/porch/).   
+Documentation of Porch is available in the [Porch documentation page](https://docs.porch.nephio.org/).

docs/config.toml

@@ -89,7 +89,7 @@ archived_version = false
 version = "latest"
 
 # The version of the latest code build
-latestTag = "1.5.5"
+latestTag = "1.5.6"
 
 # latest tested versions
 version_docker = "v28.1.1"