Added new logos

[Randynamic]

@enobayram Can you review?

[enobayram]

@Randynamic, thank you very much for the PR, I believe we need to update the following files as well:

• https://github.com/kadena-io/block-explorer/blob/master/static/kadena-k-logo.png
• https://github.com/kadena-io/block-explorer/blob/master/static/kadena-full-logo.png
• https://github.com/kadena-io/block-explorer/blob/master/static/kadena-full-logo-cropped.png