Update roadmap

[sgerbino]

Resolves #68.

Brief description

Tightens up and improves the roadmap.

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

[netlify[bot]]

✅ Deploy Preview for koinos-io ready!

Name	Link
🔨 Latest commit	9ec6c249207019c6b6b85078cdf34ffe8848bca9
🔍 Latest deploy log	https://app.netlify.com/sites/koinos-io/deploys/667c736fa6f3180008c15c86
😎 Deploy Preview	https://deploy-preview-83--koinos-io.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.