chore: normalize quote style in playbooks (#9)

## Summary
- Standardize single quotes to double quotes across deploy, destroy, provision, and restore playbooks

## Test plan
- No functional changes — formatting only

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Reviewed-on: #9
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>

playbooks/destroy.yml

@@ -6,7 +6,7 @@
   tasks:
     - name: Destroy Terraform.
       community.general.terraform:
-        project_path: '../terraform'
+        project_path: "../terraform"
         state: "absent"
         init_reconfigure: true
         force_init: true