[footer-add-links] add linkedin icon/link and color.js attribution to footer

[stacyk]

Description

The following was added to the footer:

• linkedin icon/link
• link and credit to colorjs.io

Steps to test/reproduce

Look at footer, test 2 new links

Show me

Trello cards

https://trello.com/c/UinbMJQZ/9-i-want-links-to-different-social-landing-pages-on-oddcontrast https://trello.com/c/69CQOwMQ/54-i-want-an-attribution-link-to-colorjsio

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[stacyk]

I want an attribution link to colorjs.io.

[stacyk]

I want links to different social landing pages on OddContrast