Flatten the cli structure, add docs generation in the Makefile and remove crds/Makefile

docs/cli/cli-docs.md

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+# NAME
+
+k3kcli - CLI for K3K
+
+# SYNOPSIS
+
+k3kcli
+
+```
+[--debug]
+```
+
+**Usage**:
+
+```
+k3kcli [GLOBAL OPTIONS] command [COMMAND OPTIONS] [ARGUMENTS...]
+```
+
+# GLOBAL OPTIONS
+
+**--debug**: Turn on debug logs
+
+
+# COMMANDS
+
+## cluster
+
+cluster command
+
+### create
+
+Create new cluster
+
+>k3kcli cluster create [command options] NAME
+
+**--agent-args**="": agents extra arguments
+
+**--agents**="": number of agents (default: 0)
+
+**--cluster-cidr**="": cluster CIDR
+
+**--kubeconfig**="": kubeconfig path (default: "/home/jpgouin/.kube/config")
+
+**--kubeconfig-server**="": override the kubeconfig server host
+
+**--mode**="": k3k mode type (shared, virtual) (default: "shared")
+
+**--namespace**="": namespace to create the k3k cluster in
+
+**--persistence-type**="": persistence mode for the nodes (ephemeral, static, dynamic) (default: "dynamic")
+
+**--server-args**="": servers extra arguments
+
+**--servers**="": number of servers (default: 1)
+
+**--service-cidr**="": service CIDR
+
+**--storage-class-name**="": storage class name for dynamic persistence type
+
+**--token**="": token of the cluster
+
+**--version**="": k3s version
+
+### delete
+
+Delete an existing cluster
+
+>k3kcli cluster delete [command options] NAME
+
+**--kubeconfig**="": kubeconfig path (default: "/home/jpgouin/.kube/config")
+
+**--namespace**="": namespace to create the k3k cluster in
+
+## kubeconfig
+
+Manage kubeconfig for clusters
+
+### generate
+
+Generate kubeconfig for clusters
+
+**--altNames**="": altNames of the generated certificates for the kubeconfig
+
+**--cn**="": Common name (CN) of the generated certificates for the kubeconfig (default: "system:admin")
+
+**--config-name**="": the name of the generated kubeconfig file
+
+**--expiration-days**="": Expiration date of the certificates used for the kubeconfig (default: 356)
+
+**--kubeconfig**="": kubeconfig path (default: "/home/jpgouin/.kube/config")
+
+**--kubeconfig-server**="": override the kubeconfig server host
+
+**--name**="": cluster name
+
+**--namespace**="": namespace to create the k3k cluster in
+
+**--org**="": Organization name (ORG) of the generated certificates for the kubeconfig