Add InsightJournal to list of openjournals at https://www.theoj.org/

After reviewing the following, I suggest to evaluate adding the InsightJournal to https://www.theoj.org/

> Ownership & Governance
>
> Open Journals and each of its journals are community-organized and volunteer-led, with an editor-in-chief who leads each journal. Open Journals is fiscally sponsored by [NumFOCUS](https://numfocus.org/), and has a [documented governance structure](https://github.com/openjournals/governance).

Source: https://www.theoj.org/

References:
* https://www.theoj.org/
* https://github.com/openjournals/openjournals.github.io/blob/master/index.html

Review the referenced openjournals.github.io/index.html and thej.org to understand how journals are listed and what criteria apply. Confirm whether InsightJournal should be added and record the decision; done means the listing is updated if approved.

Scritto dal modello di indicizzazione a partire dal testo della issue.