Option to give navigation Links at the starting of articles extract in the html and pdf documents

[RamolaWeb]

It will be great to create a navigation links at the starting of the documents to navigate in the html and pdf documents.The user does not knows about which article are extracted , so it will be nice to have it.

[CuriousLearner]

Sure, sounds good to me. Would you like to work on this @RamolaWeb ?

[RamolaWeb]

@CuriousLearner Please assign this to me and I will send a pull request asap