[community] Apache Ignite 2021 wallpapers for desktop & mobile

[Kseniya Romanova]

Hi Igniters!

New wallpapers are already in our special repository [1]. Some of them you
can also use as zoom background during the calls.

GridGain DevRel team wishes you happy holidays!

[1]
https://github.com/apache/ignite-website/tree/master/images/wallpapers/2021

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Cheers,
Kseniya

Devrel at GridGain
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