move CactusCode.org to be hosted by github pages

[Roland Haas]

This current host for https://cactuscode.org has become hard to maintain as well as the website itself very rarely seeing updates. To simplify maintaining it@Ian Hinder and @Steven R. Brandt are exploring hosting it on github’s pages facilities instead.

The current repository is https://github.com/EinsteinToolkit/cactuscode.org in the gh-pages branch and it can be tested at http://test.cactuscode.org/

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[Roland Haas]

Once done the reference to the life wavedemo in Cactus’s README.md https://bitbucket.org/cactuscode/cactus/src/master/README.md should be removed.

[Roland Haas]

http://www.cactuscode.org moved to github pages in 2020 (see https://github.com/EinsteinToolkit/www.cactuscode.org/issues/19).

Git hash e825525d "Cactus: remove link to removed wavetoy demo server" of cactus removes the now dead link.