fix(vite-plugin-nitro): fix prerender from content directory

[remes2000]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• [-] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Which package are you modifying?

• vite-plugin-angular
• vite-plugin-nitro
• astro-angular
• create-analog
• router
• platform
• content
• nx-plugin
• trpc

What is the current behavior?

#894

Closes #

What is the new behavior?

The user can specify the contentDir with and without adding '/' as first character

Does this PR introduce a breaking change?

• Yes
• No

While setting up the content directory the user has access to "transform" property, that's a callback. The callback is being called with the object returned by getMatchingContentFilesWithFrontMatter as its argument. Property "path" used to be always starting with '/' as first character but it's not anymore. Right now it's a relative path from root to content directory. I think that's the expected behavior.

Other information

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[remes2000]

I don't know why is the pipeline red, but I've noticed it was also red for this one: #893 so I assume that's not on me :D Let me know if I have to do anything

[brandonroberts]

Thanks! @allcontributors add @remes2000 for code

[allcontributors]

@brandonroberts

I've put up a pull request to add @remes2000! 🎉