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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Details

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[github-actions]

@fuxingloh: There are no 'area' labels on this issue. Adding an appropriate label will greatly expedite the process for us. You can add as many area as you see fit. If you are unsure what to do you can ignore this!

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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.