Quickstart: region mixin

[hans-d]

Describe the Bug

The quickstart provides an exampe for the vpc component with region mixin.
When generating the vars, the vars from the region mixin are not included.

Expected Behavior

region vars included

Steps to Reproduce

Follow the quickstart

Screenshots

atmos/website/docs/quick-start/create-atmos-stacks.md

Lines 207 to 225 in 9fe34c0

	In `stacks/mixins/region/us-west-2.yaml`, add the following config:
	```yaml title="stacks/mixins/region/us-west-2.yaml"
	vars:
	region: us-west-2
	environment: uw2
	components:
	terraform:
	vpc:
	metadata:
	component: infra/vpc
	vars:
	availability_zones:
	- us-west-2a
	- us-west-2b
	- us-west-2c
	```

atmos/website/docs/quick-start/create-atmos-stacks.md

Lines 314 to 351 in 9fe34c0

	In `stacks/orgs/acme/core/dev/us-east-2.yaml`, add the following config:
	```yaml title="stacks/orgs/acme/core/dev/us-east-2.yaml"
	# Import the region mixin, the defaults, and the base component configurations from the `catalog`.
	# `import` supports POSIX-style Globs for file names/paths (double-star `**` is supported).
	# File extensions are optional (if not specified, `.yaml` is used by default).
	import:
	- mixins/region/us-east-2
	- orgs/acme/core/dev/_defaults
	- catalog/vpc
	- catalog/vpc-flow-logs-bucket
	components:
	terraform:
	vpc-flow-logs-bucket-1:
	metadata:
	# Point to the Terraform component in `components/terraform` folder
	component: infra/vpc-flow-logs-bucket
	inherits:
	# Inherit all settings and variables from the
	# `vpc-flow-logs-bucket/defaults` base Atmos component
	- vpc-flow-logs-bucket/defaults
	vars:
	# Define variables that are specific for this component
	# and are not set in the base component
	name: vpc-flow-logs-bucket-1
	# Override the default variables from the base component
	traffic_type: "REJECT"
	vpc-1:
	metadata:
	# Point to the Terraform component in `components/terraform` folder
	component: infra/vpc
	inherits:
	# Inherit all settings and variables from the `vpc/defaults` base Atmos component
	- vpc/defaults
	vars:

Environment

No response

Additional Context

When changing the "vpc" in the regions mixin to "vpc-1", the vars from the region mixin are included in the generated vars.