chore: Replace Makefile with atmos.yaml (#86)

Author: osterman

Makefile

@@ -22,7 +22,7 @@ badges:
     url: https://github.com/cloudposse/terraform-aws-ec2-instance-group/commits
   - name: Slack Community
     image: https://slack.cloudposse.com/for-the-badge.svg
-    url: https://slack.cloudposse.com
+    url: https://cloudposse.com/slack
 
 # List any related terraform modules that this module may be used with or that this module depends on.
 related:
@@ -154,8 +154,5 @@ references:
   - name: "terraform-aws-ec2-bastion-server"
     description: "Terraform module to define a generic Bastion host with parameterized user_data"
     url: "https://github.com/cloudposse/terraform-aws-ec2-bastion-server"
-include:
-  - "docs/targets.md"
-  - "docs/terraform.md"
-# Contributors to this project
+include: []
 contributors: []

README.yaml

@@ -0,0 +1,12 @@
+# Atmos Configuration — powered by https://atmos.tools
+#
+# This configuration enables centralized, DRY, and consistent project scaffolding using Atmos.
+#
+# Included features:
+# - Organizational custom commands: https://atmos.tools/core-concepts/custom-commands
+# - Automated README generation: https://atmos.tools/cli/commands/docs/generate
+#
+
+# Import shared configuration used by all modules
+import:
+  - https://raw.githubusercontent.com/cloudposse/.github/refs/heads/main/.github/atmos/terraform-module.yaml