Update authentication.mdx - remove Lucia

[johnnydecimal]

Description (required)

As per Lucia's home page, they are no longer building an auth library and the existing library is being deprecated.

This change removes Lucia from the suggested list of auth providers and is a documentation change only.

[netlify]

✅ Deploy Preview for astro-docs-2 ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	ba4ae69
🔍 Latest deploy log	https://app.netlify.com/sites/astro-docs-2/deploys/673d690645b129000812ef04
😎 Deploy Preview	https://deploy-preview-10064--astro-docs-2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[astrobot-houston]

Lunaria Status Overview

🌕 This pull request will trigger status changes.

Learn more

By default, every PR changing files present in the Lunaria configuration's files property will be considered and trigger status changes accordingly.

You can change this by adding one of the keywords present in the ignoreKeywords property in your Lunaria configuration file in the PR's title (ignoring all files) or by including a tracker directive in the merged commit's description.

Tracked Files

File	Note
en/guides/authentication.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[astrobot-houston]

Hello! Thank you for opening your first PR to Astro’s Docs! 🎉

Here’s what will happen next:

1. Our GitHub bots will run to check your changes.
   If they spot any broken links you will see some error messages on this PR.
   Don’t hesitate to ask any questions if you’re not sure what these mean!

2. In a few minutes, you’ll be able to see a preview of your changes on Netlify 🥳.

3. One or more of our maintainers will take a look and may ask you to make changes.
   We try to be responsive, but don’t worry if this takes a few days.

[sarah11918]

Thank you, @johnnydecimal ! We had updated the Lucia section on this page, but you're right, it shouldn't be listed as a library in the overview anymore! Thank you for spotting and taking the time to correct, and welcome to Team Docs! 🥳