Software Center polished icon theme

[DavidePrincipi]

NS8 applications currently use inconsistent icon shapes, resulting in a visually cluttered appearance in the Software Center.

Proposed solution

Define and apply a consistent icon style based on fixed design rules, to provide a cleaner and more uniform look in the Software Center.

Alternative solutions

None considered.

Additional context

During the MY portal development, a set of icons for some NS8 applications was already produced.

See also

• Discussion https://mattermost.nethesis.it/nethserver/pl/mi81yjxxwfgt8pq4k5tes7trbc

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Thanks to @AmaLuci