fix(tailwind): allow different fontSize configuration values

[czondi]

Description

Fixes an issue where only one type of value is allowed for configuring fontSize in the Tailwind theme. Tailwind supports the following values:

module.exports = {
  theme: {
    fontSize: {
      sm: '0.8rem', // single value
      base: ['16px', '24px'], // [fontSize, lineHeight] tuple
      'lg': ['1.5rem', {
        lineHeight: '2rem',
        letterSpacing: '-0.01em',
        fontWeight: '500',
      }], // [fontSize, { lineHeight?, letterSpacing?, fontWeight? }] tuple
    }
  }
}

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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