Resolve "Split scheduled and ongoing maintenances"

What does this MR do and why?

• change(template.Home): Add new section containing only SCHEDULED Maintenances (#50 (closed))
• change(template.Service): Add new section containing only SCHEDULED Maintenances (#50 (closed))
• change(template.Scope): Add new section containing only SCHEDULED Maintenances (#50 (closed))

Screenshots or screen recordings

MR acceptance checklist

• My code follows the style guidelines of this project
• I ran pylint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Closes #50 (closed)