Update projects in overview diagram to include Pixie

[philkuz]

Pixie was recently upgraded to major (#231). We should add the project logo in the "overview" diagram.

Signed-off-by: Phillip Kuznetsov [email protected]

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[philkuz]

Thanks @dthaler for the approval. @xmulligan any feedback on this PR, or do you think we can merge it?

[xmulligan]

@philkuz Sorry for the delay /lgtm