refactor(content-docs): move isCategoriesShorthand to utils

[armano2]

Motivation

Move isCategoriesShorthand from types to utils
Ensure that type imports are marked as such

Have you read the Contributing Guidelines on pull requests?

yes

Note

maybe we should consider enabling

    {
      files: ['*.ts', '*.tsx'],
      rules: {
        '@typescript-eslint/consistent-type-imports': [
          ERROR,
          {
            prefer: 'type-imports',
            disallowTypeAnnotations: false,
          },
        ],
      },
    },

[netlify]

✔️ [V2]
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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	80
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5962--docusaurus-2.netlify.app/

[Josh-Cena]

Thanks👍

I did think about consistent-type-imports, but when we do both value and type imports (e.g. with React), it's split into two lines. I'd rather wait until ts-eslint supports type import/export modifiers