Add media kit page and assets

[brklyn8900]

Resolves #25

Brief description

Add media kit page so that 3rd parties can have easy access to Koinos branding assets.

Checklist

• [x] I have built this pull request locally
• [ ] I have ran the unit tests locally
• [x] I have manually tested this pull request
• [x] I have reviewed my pull request
• [ ] I have added any relevant tests

Demonstration

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[sgerbino]

Should this be accessible via link? There's no way to get to the page or know it exists. Let's discuss at standup.