Adds a new logo for Kompose (#1574)

Woo! Our new logo!

It's a little cartoon octopus inside of a septagon (similar to
Kubernetes).

It's to show how "composable" we similar to an octopus.

I've gone ahead and updated the documentation as well as the website.

docs/assets/favicons/safari-pinned-tab.svg

@@ -9,17 +9,7 @@ Created by potrace 1.14, written by Peter Selinger 2001-2017
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