Migrate eTrice website to Docusaurus
The eTrice website https://www.etrice.dev/etrice is based on an Eclipse library in PHP at the moment.
The usage of PHP for project content on eclipse.dev is proposed to be removed by Dec 31, 2024, see eclipsefdn/helpdesk#1934 (closed). Similarly, the usage of PHP for downloads and archives is proposed to be removed by Dec 31, 2025.
We thus decided to migrate the eTrice website to Docusaurus which we use already for the documentation site.