Image in blog post now all have a subtile

[hendrikebbers]

On the Hugo version it was defined by attribute if subtitle of an image is shown. On the NextJS version subtitles are always shown.
Example: Support & Care Logo in the following blog post:

https://deploy-preview-306--open-elements.netlify.app/de/posts/2026-02-10-review-2025#support--care
https://open-elements.com/de/posts/2026/02/10/jahresrückblick-2025/#support--care