Remove mention of autoscaling-mixed-instances in readme #74

Job	Run time
Module max TF version	3s
Get root directories	2s
Max TF pre-commit (1.8.5)	2m 45s
Min TF validate (.)	21s
Min TF validate (./modules/iam/ecs-instance-profile)	18s
Min TF validate (./modules/simple/fargate-spot)	17s
Min TF validate (./modules/simple/ec2)	18s
Min TF validate (./modules/simple/fargate)	26s
Min TF validate (./modules/scheduled-actions)	25s
Min TF validate (./modules/autoscaling/alb-target-tracking/target-requests-count)	22s
Min TF validate (./modules/autoscaling/alb-target-tracking/target-response-time)	18s
Min TF validate (./modules/autoscaling/ecs-target-tracking/service-utilization)	16s
Min TF validate (./modules/autoscaling/ecs-scheduled)	19s
Min TF validate (./modules/autoscaling/asg-target-tracking/ecs-reservation)	18s
Min TF validate (./modules/core/ecs-autoscaling-target)	19s
Min TF validate (./modules/core/service)	20s
Min TF validate (./modules/core/task)	20s
Min TF validate (./examples/complete-ecs)	18s
Min TF validate (./examples/easy/ec2-managed-draining)	35s
Min TF validate (./examples/easy/fargate-alb)	26s
Min TF validate (./examples/easy/fargate-spot)	17s
Min TF validate (./examples/easy/ec2)	17s
Min TF validate (./examples/easy/fargate)	18s
Min TF validate (./examples/easy/ec2-alb)	25s
Min TF validate (./examples/easy/ec2-distinct)	18s
	10m 21s

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