docs: Added a video introduction to Kaniko

[vfarcic]

No description provided.

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[vfarcic]

@googlebot I signed it!

[vbehar]

ahah @vfarcic you are everywhere! ;-)

[vfarcic]

@vbehar Yeah. Those videos are my weekend (outside office hours) pet projects.

Do you know what I need to do to merge this one?

[vbehar]

ping @tejal29 - or ask on the kaniko channel in the kubernetes slack

[tejal29]

Add a new references section