Refactor devoups gatus config file

Description

This MR will refactor gatus configuration file. Going from 459L to 287. Linked to issue #32

List of components affected

• Devoups gatus

Status

• To be squashed
• CI passed
• Ready for review

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Non Functional Requirements

• Formatted with nixfmt
• Tests Coverage for the new code
• All new and existing tests passed
• Documentation

Checklist before submitting MR

• Your MR is not a duplicate
• Your changes have been made in a separate branch
• Your commits have a descriptive commit title AND a descriptive commit description. If not, make sure it's not a problem if we squash all the commits in the MR.