Outdated README and Makefile (`make dev-debug`)

[yamaceay]

What happened?

I expected the make dev-debug command to set up a local development environment with Argo CD and Crossplane using Kind and Helm. However, it failed during the Crossplane CRD installation step:

dev-debug: $(KIND) $(KUBECTL)
        ...
	@$(INFO) Installing Crossplane CRDs
	@$(KUBECTL) apply -k https://github.com/crossplane/crossplane//cluster?ref=master
        ...

with the following error:

13:04:19 [ .. ] Installing Crossplane CRDs
error: git cmd = '/usr/local/bin/git fetch --depth=1 origin master': exit status 128
make: *** [dev-debug] Error 1

Additionally, make submodules step is missing in the README documentation to build. Before building or running the provider, we have to make sure the required "build" Make submodule is initialized, which supports CI/CD tasks shared across all providers.

How can we reproduce it?

You can run make dev-debug.

What environment did it happen in?

Crossplane version: 2.0.2
Crossplane Provider argocd version: 0.13.0
Kubectl:

• Client Version: v1.31.4
• Kustomize Version: v5.4.2
• Server Version: v1.24.0
  Hardware:
• Model: MacBook Pro, 16'', 2019
• Processor: 2,4 GHz 8-Core Intel Core i9