Added CellTypeSource and BillboardTextActor, fixed ClassesInLang1NotInLang2

Add pythonic api examples 1

See merge request !327

Added a warning about the VTK version to use
 and links to the VTK master documentation.

# Conflicts:
#   src/Admin/ScrapeRepo.py
#   src/Testing/Data/Fast.json

Fix small typos `paramater` and `recomended`

See merge request !335

Revert "add button to hide logs"

See merge request !336

This reverts commit 9734a4a6.

This reverts commit 18481259.

This reverts commit ce6ff092.

This reverts commit 8bd5ebdb.

See: vtk!10820 (9d9fd077)

See: vtk@93e6c3c8