fix: added basic docs for nutanix mutations

docs/content/customization/nutanix/_index.md

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+
++++
+title = "Nutanix"
+icon = "fa-brands fa-nutanix"
++++
+
+The customizations in this section are applicable only to Nutanix clusters. They will only be applied to clusters that
+use the `Nutanix` infrastructure provider, i.e. a CAPI `Cluster` that references an `NutanixCluster`.

docs/content/customization/nutanix/control-plane-endpoint.md

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+title = "Control Plane Endpoint"
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+
+Configure Control Plane Endpoint. Defines the host IP and port of the CAPX Kubernetes cluster.
+
+## Examples
+
+### Set Control Plane Endpoint
+
+
+```yaml
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: Cluster
+metadata:
+  name: <NAME>
+spec:
+  topology:
+    variables:
+      - name: clusterConfig
+        value:
+          nutanix:
+            controlPlaneEndpoint:
+              host: x.x.x.x
+              port: 6443
+```
+
+Applying this configuration will result in the following value being set:
+
+- control-plane NutanixClusterTemplate:
+
+```yaml
+spec:
+  template:
+    spec:
+      controlPlaneEndpoint:
+        host: x.x.x.x
+        port: 6443
+```

docs/content/customization/nutanix/machine-details.md

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+title = "Machine Details"
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+
+Configure Machine Details of Control plane and Worker nodes
+
+## Examples
+
+### Set Machine details of Control Plane and Worker nodes
+
+```yaml
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: Cluster
+metadata:
+  name: <NAME>
+spec:
+  topology:
+    variables:
+      - name: clusterConfig
+        value:
+          controlPlane:
+            nutanix:
+              machineDetails:
+                bootType: legacy
+                cluster:
+                  name: pe-cluster-name
+                  type: name
+                image:
+                  name: os-image-name
+                  type: name
+                memorySize: 4Gi
+                subnets:
+                - name: subnet-name
+                  type: name
+                systemDiskSize: 40Gi
+                vcpuSockets: 2
+                vcpusPerSocket: 1
+      - name: workerConfig
+        value:
+          nutanix:
+            machineDetails:
+              bootType: legacy
+              cluster:
+                name: pe-cluster-name
+                type: name
+              image:
+                name: os-image-name
+                type: name
+              memorySize: 4Gi
+              subnets:
+              - name: subnet-name
+                type: name
+              systemDiskSize: 40Gi
+              vcpuSockets: 2
+              vcpusPerSocket: 1
+```
+
+Applying this configuration will result in the following value being set:
+
+- control-plane NutanixMachineTemplate:
+
+```yaml
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: NutanixMachineTemplate
+metadata:
+  name: nutanix-quick-start-cp-nmt
+spec:
+  template:
+    spec:
+      bootType: legacy
+      cluster:
+        name: pe-cluster-name
+        type: name
+      image:
+        name: os-image-name
+        type: name
+      memorySize: 4Gi
+      providerID: nutanix://vm-uuid
+      subnet:
+      - name: subnet-name
+        type: name
+      systemDiskSize: 40Gi
+      vcpuSockets: 2
+      vcpusPerSocket: 1
+```
+
+- worker nodes NutanixMachineTemplate:
+```yaml
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: NutanixMachineTemplate
+metadata:
+  name: nutanix-quick-start-md-nmt
+spec:
+  template:
+    spec:
+      bootType: legacy
+      cluster:
+        name: pe-cluster-name
+        type: name
+      image:
+        name: os-image-name
+        type: name
+      memorySize: 4Gi
+      providerID: nutanix://vm-uuid
+      subnet:
+      - name: subnet-name
+        type: name
+      systemDiskSize: 40Gi
+      vcpuSockets: 2
+      vcpusPerSocket: 1
+```

docs/content/customization/nutanix/prism-central-endpoint.md

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+title = "Prism Central Endpoint"
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+
+Configure Prism Central Endpoint to create machines on.
+
+## Examples
+
+### Set Prism Central Endpoint
+
+```yaml
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: Cluster
+metadata:
+  name: <NAME>
+spec:
+  topology:
+    variables:
+      - name: clusterConfig
+        value:
+          nutanix:
+            prismCentralEndpoint:
+              credentials:
+                name: secret-name
+              host: x.x.x.x
+              insecure: false
+              port: 9440
+```
+
+Applying this configuration will result in the following value being set:
+
+- control-plane NutanixClusterTemplate:
+
+```yaml
+spec:
+  template:
+    spec:
+      prismCentral:
+        address: x.x.x.x
+        insecure: false
+        port: 9440
+        credentialRef:
+          kind: Secret
+          name: secret-name
+```