* sololearn tutorials from #7188
* alphabetize
* add webpack course from #8031
* add a course from #8853
seems to cause linter failure? adding here to double check
* was worth a try
* update a title (from #7651)
* move learnxiny to books
as suggested in #7687
* add arduino course from #7765
* add resource from #7825
* Big Data resources from #7939
* move youtube courses from books-id to courses-id
* normalizing riptutorial attribution
c7d60efd43