🚸 Status page - add group action adds the new group at the top #884

Description

UX issue

When having lots of monitors and groups (hence having to scroll down to see the bottom of the list), adding a new group to the status page is a frustrating experience :

when the user clicks the + Add Group button, nothing moves on the visible part of the screen (the new entry is added at the bottom)
the user has to scroll all the way down to find the new group entry

And when adding multiple groups, the user experiences repeatedly having to scroll up and down

Proposed change

Instead of adding the new group entry at the bottom of the page, add the new group entry at the top

Type of change

User Interface

Checklist

My code follows the style guidelines of this project
I ran ESLint and other linters for modified files
I have performed a self-review of my own code and test 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)