chore(fp-ts): first refactor of createImgixBase64FieldConfig

[frederickfogerty]

This is part of the Gatsby fp-ts refactor.

[frederickfogerty]

Current dependencies on/for this PR:

• next
  • PR #186
  • PR #187 (this PR)
    • PR #188
    • PR #189
      • PR #191
      • PR #192
        • PR #193
        • PR #194
          • PR #195
          • PR #196
            • PR #197

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[frederickfogerty]

This was also merged locally