[td-p1] improve logo.md

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What/Why/How?

Improve dev portal tutorial

• add section about changing logo size + general edits

Reference

https://developer-portal-starter.redoc.ly/developer-portal/logo/

Check yourself

• [X] Code is linted - ran yarn run clean
• [X] Tested - checked local output @ http://localhost:3000/
• [ ] All new/updated code is covered with tests

Security

• [ ] Security impact of change has been considered
• [ ] Code follows company security practices and guidelines

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part 1 complete - review at your leisure!

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Changed branch name to td-p1 > see new pull request #120