Color updates

[nataliafitzgerald]

Update color palette page to include pantone values and full primary palette as discussed here: https://github.com/cfpb/design-manual/issues/327#issuecomment-314831623

Additions

• Adds pantone values for primary and secondary colors
• Adds colors to the primary palette
• CSS change to allow for 2 rows of 3 columns for primary palette
• Content tweaks

Removals

• No removals

Changes

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Testing

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Review

• @cfarm

Preview this PR without the whitespace changes

Screenshots

Notes

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Todos

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Checklist

• [ ] Changes are limited to a single goal (no scope creep)
• [ ] Code can be automatically merged (no conflicts)
• [ ] Code follows the standards laid out in the front end playbook
• [ ] Passes all existing automated tests
• [ ] New functions include new tests
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged
• [ ] Visually tested in supported browsers and devices
• [ ] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)

[cfarm]

Added some fixes to the class names to make the secondary palette grid 4 columns. Here's a screenshot of all these changes: