This is needed since the previous sources are now outdated.
Refs #31

For details see https://github.com/datasets/covid-19/runs/529587569?check_suite_focus=true

We have a resource with data by province but it is not aggregated by country, e.g., if you need data for China you'd need to sum up all its provinces.

proposed corrections to the README.md

The reason is that the upstream repo is not fully updated on regular basis. At 23:59 GMT it adds a new data file per date but the files we're depending on are updated manually after that.

- worldwide resource had extra columns that is not needed, eg, country, province, lat, lon.

* Refactor intro and extend
* Detail data and its sources
* Add license section explaining public domain licensing
* also tweak data package title.

Data Package improvements

Correct typo

script*

Daily auto-update of the data

It is required as github doesn't allow underscore in the secret name.

[docs][xs]: fix "effected" => "affected" - refs #12

dataset link update