documentation page on ET site points to outdated tutorial

[Roland Haas]

The documentation page https://www.einsteintoolkit.org/documentation.html points to the outdated “Simplified Tutorial” and is otherwise pretty much out of date.

It should be updated to use only the CCT hosted tutorial, and possible provide links to Miguel’s and Frank’s and Nick Choustikov’s ET description papers.

[Roland Haas]

hackathon (website update, easy)

[Roland Haas]

Applied as git hash 247bebe "papers: add Zilhao&Loeffler and Choustikov tutorials" of www