Trial bar buttons need to be links

[davidlygagnon]

Thank you for filing an issue!

Issue found in Trial-Bar component:

• Text on buttons is blue. It should be white.
• There should be a link/button or maybe a link component available.

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• Why do my icons not show up in IE11?
• Why aren't my ES6 imports, icons, styles, or fonts working in Create React App?

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This project uses SLDS markup, but you should submit HTML/CSS issues to https://github.com/salesforce-ux/design-system.