Remove references to hack/generated and hack/generator (#3223)

* Rename gitmodule
* Update docs
* Remove unused golden files

.gitmodules

@@ -1,3 +1,3 @@
-[submodule "hack/generator/specs/azure-rest-api-specs"]
+[submodule "azure-rest-api-specs"]
 	path = v2/specs/azure-rest-api-specs
 	url = https://github.com/Azure/azure-rest-api-specs

docs/hugo/content/contributing/add-a-new-code-generated-resource.md

@@ -85,8 +85,8 @@ Once you have a working development environment, run the `task` command to run t
 ### \<Resource\> looks like a resource reference but was not labelled as one
 
 Example:
-> Replace cross-resource references with genruntime.ResourceReference:
-> ["github.com/Azure/azure-service-operator/hack/generated/_apis/containerservice/v1alpha1api20210501/PrivateLinkResource.Id" looks like a resource reference but was not labelled as one.
+> Replace cross-resource references with genruntime.ResourceReference:  
+> ["github.com/Azure/azure-service-operator/v2/apis/containerservice/v1api20210501/PrivateLinkResource.Id" looks like a resource reference but was not labelled as one.
 
 To fix this error, determine whether the property in question is an ARM ID or not, and then update the `objectModelConfiguration` section in the configuration file.
 

docs/hugo/content/contributing/developer-setup.md

@@ -144,11 +144,13 @@ From the root of your ASO repo clone, run
 
 ``` bash
 $ git submodule init
-Submodule 'hack/generator/specs/azure-rest-api-specs' (https://github.com/Azure/azure-rest-api-specs) registered for path 'specs/azure-rest-api-specs'
+Submodule 'azure-rest-api-specs' (https://github.com/Azure/azure-rest-api-specs) registered for path 'v2/specs/azure-rest-api-specs'
 
 $ git submodule update
 Cloning into '/workspaces/azure-service-operator/v2/specs/azure-rest-api-specs'...
-Submodule path 'specs/azure-rest-api-specs': checked out '3ac733b1b1c63969fbed0c7ffe60ff5cccc708c7'
+remote: Enumerating objects: 15, done.
+... elided ...
+Submodule path 'v2/specs/azure-rest-api-specs': checked out '35f8372749cbe9b1f69bde0eee3b0bc63c49c2c2'
 ```
 
 The exact git hash that's checked out will likely be different.