i18n(pt-BR): Updating & Creating missing guides

[Alynva]

Description (required)

• Created guides/actions.mdx
• Created guides/authentication.mdx

References

• Closes #...

• Related to ...

• For Astro version x.x.x

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Tracked Files

File	Note
pt-br/guides/actions.mdx	Localization added, will be marked as complete.
pt-br/guides/authentication.mdx	Localization added, will be marked as complete.

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.

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[Alynva]

Leaving this PR with only these two pages to not have a long review-time, I'll create other PRs for the other missing guides

[yanthomasdev]

Thanks @Alynva, we got an update to the Authentication page, could you take a look? 741c1b8#diff-dc44b094f1fcc7d858198f1603502771479aad9ea1b464a6cb2ef2313bdc35a4