release v2.2.3

update changelog

Merge branch 'main' of github.com:getkeops/keops

add info about pkgdown website generation

release of v2.1.2

cosmetic

version 2.1

Update changelog and version number

Update the number of loops in the benchmarks.

release of rkeops v1.4.2.2 on CRAN (replace unrelease v1.4.2.1)