Merge remote-tracking branch 'origin/feature/9604_classmaker_and_rst'
Merge remote-tracking branch 'origin/feature/9447_findpeaks_rm_property'
Remove wiki from user algorithms. Refs #9592.
Remove wiki from remaining algorithms. Refs #9592.

- Interestingly, CentroidPeaks has an .rst file, which also has the wiki!
- SliceMDHisto on the other hand, did not have an .rst file.
Merge branch 'feature/9592_remove_final_wiki' into develop