add dynamic base URL config for Zola preview deployments

[welpo]

Summary

Adds documentation to help users solve a common issue with Zola deployments on Cloudflare Pages where preview deployments don't properly load stylesheets due to base URL configuration. Example: welpo/tabi#521

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Enhanced documentation for Zola deployments on Cloudflare Pages to address base URL configuration issues during preview deployments.

• Added section on handling preview deployments for Zola sites
• Provided a dynamic build command to set base URL based on the environment
• Clarified the impact of hardcoded base URLs on asset loading

Modified Files

• src/content/docs/pages/framework-guides/deploy-a-zola-site.mdx

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