feat: add support for ble.sh

[mgastonportillo]

All submissions

• [x] I have followed the Contributing Guidelines
• [x] I have checked to ensure there aren't other open Pull Requests for the same update/change

Adding/updating Application X Support

• [x] This PR is only for one application
• [x] It has been added to the list of supported applications in the README
• [x] Changes have been added to the WIP section of the CHANGELOG
• [x] Syncing does not break the application
• [x] Syncing does not compete with any syncing functionality internal to the application
• [x] The configuration syncs the minimal set of data
• [x] No file specific to the local workstation is synced
• [x] No sensitive data is synced

Improving the Mackup codebase

• [x] My submission passes the tests
• [x] I have linted the code locally prior to submission
• [ ] I have written new tests as applicable
• [ ] I have added an explanation of what the changes do