`contented-preview`: should use `NextNProgress`

[fuxingloh]

What would you like to be added:

Use NextNProgress for content-preview.

Why is this needed:

SPA navigating to content has no visual cue, NextNProgress adds it.

[github-actions]

@fuxingloh: Thanks for opening an issue, it is currently awaiting triage.

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[github-actions]

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Details

I am a bot created to help the BirthdayResearch developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.