Migrate gulp logic to ESM equivalent

[EdricChan03]

CI has been failing ever since the migration of the code to use ESModules - we should consider migrating to a different tooling for what is currently just parsing Markdown files to their HTML equivalent

Perhaps we could also consider using Analog which offers the ability to render content using a pre-processor (this would remove the need to still fetch the HTML content to be inserted into the DOM)

[github-actions]

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