update codemeta

fix URLs

update R version in badge

update R versions in CI platforms

add codemeta.json

update site

fix review comments

1. Write a new vignette that uses internal data-sets
2. make error messages more user friendly
3. add CONTRIBUTING.md
4. edit and move paper.md to root
5. use @title, @description, @details and @section  tags
6.  almost all get* functions use @Rdname get_tables
7. rewrite tests using skip_on_cran() and a custom skip_if_not_online() function
8.  run goodpractice::gp() with clear output

skip heavy web usage tests

fix dates

remove bullets