Add TRIDEC Cloud to spotlights

We want to add the TRIDEC Cloud as a spotlight to the HIFIS website. CC @mrtnhmtz

@frust45, @konrad, @christian.meessen, @jandt-desy

👉 Review here

/edit by @christian.meessen: adding checklist

Checklist for reviewers

• Update date_added attribute
• License is named by SPDX identifier
• All links are pointing to the right place