Soft launch fsa-style@2.7.3 dependency

[francisrupert]

Once USDA-FSA/fsa-style#564 is complete, do the minimum to doc site's fsa-style dependency updated to latest.

Steps

• Bump package.json version
• Validate dependencies, most especially fsa-style
• Update _config.yml's fsa-style_version to latest fsa-style version
• Build and validate locally
• Validate all Issues in this Project/Milestone are complete and sitting on release/x.x.x branch.
• Merge release/x.x.x to gh-pages (effectively master)
• Git Tag gh-pages as version, e.g. 1.0.0
  • Push tag
  • Validate on https://github.com/USDA-FSA/fsa-design-system/tags
• Push gh-pages
  • Validate at http://usda-fsa.github.io/fsa-design-system
• Publish tag as a Release
• Prune local and remote branches
• Close
  • associated GitHub Project
  • associated GitHub Milestone