Add descriptions & references to zenodo datasets

[eloiferrer]

Issue description: Add long description as a string for the zenodo datasets that were already imported from the mardigmci community (https://zenodo.org/communities/mardigmci?q=&l=list&p=1&s=10&sort=newest)

Some descriptions seem to include references to citations. The metadata for this publications could also be added.

TODOS:

• [x] Create description property for long strings
• [x] Check whether description can be obtained through the zenodo API, otherwise parse it.
• [x] Insert the description in the existing items
• [x] Insert references to publications

Acceptance-Criteria

Checklist for this issue:

• [ ] Assignee has been set for this issue
• [ ] All fields of the issue have been filled
• [ ] Issue has been assigned to the main project
• [ ] Code was merged
• [ ] Feature branch has been deleted and issues were updated / closed
• [ ] Issue is tracked by an epic, or the label 'non-epic' is set to the issue.

[eloiferrer]

Description, references and license information has been added: https://tinyurl.com/yqtrgzwd The description property for long descriptions has been created: https://portal.mardi4nfdi.de/wiki/Property:P1457