fix paradox document blank toc entry

[Roiocam]

Refs: apache/pekko#975
Copy from: apache/pekko-sbt-paradox#87

result

Select Current Group to Java

Select Current Group to Scala

[Roiocam]

@samueleresca I think after apache/pekko-sbt-paradox#86, the paradox wan't generate group.js anymore, do you think these CI need to change?

[samueleresca]

Hey @Roiocam, thanks for the the help here. I think you need to change the group.js file here. To update the content folder you need to follow the manual publishing wiki. The CI simply check that the content folder has been updated locally

[Roiocam]

I think you need to change the group.js file here.

Thanks for the help, I mistakenly thought the script was static assets, I will fix that.

[samueleresca]

Looks good to me 👍🏻

[pjfanning]

lgtm