[Feature Request] Implement Image Captions in Hashnode

This feature request proposes adding image captions to the Hashnode content creation experience. Currently, Hashnode only offers alt text for images, which limits the ability to provide additional context or image credits.


**Motivation:**

* **Improved Image Context:** Image captions allow writers to elaborate on the content of an image, enhancing reader understanding and engagement.
* **Proper Attribution:** Captions offer a dedicated space to credit image creators, promoting ethical content creation practices.
* **Accessibility:** Captions can improve accessibility for visually impaired users who rely on screen readers.

**Implementation Details:**

* A new field or toggle switch could be introduced during image upload or editing, allowing users to add captions alongside alt text.
* The caption should be displayed below the image within the published content.
* Ideally, the caption formatting should be customizable (font size, color, etc.) to match the overall post aesthetics.

**Benefits:**

* **Richer Content:** Captions contribute to a more informative and engaging reading experience.
* **Ethical Content Creation:** Captions facilitate proper image attribution, fostering a culture of respect for creators.
* **Accessibility Compliance:** Captions improve accessibility for users with visual impairments.

We hope the Hashnode dev team will consider implementing image captions as a valuable addition to the content creation platform. This feature will empower writers to provide a more comprehensive and professional experience for their readers.

**Thank you for your time and consideration.**

Im Issue werden keine Dateien, Tests oder Einstiegspunkte genannt. Ermittle zuerst den Ablauf zum Hochladen und Bearbeiten von Bildern im starter kit und bestimme dann, wie veröffentlichte Bilder über den Hashnode GraphQL-Inhalt gerendert werden. Als erledigt gilt die Aufgabe, wenn Autoren Bildunterschriften getrennt vom alt text eingeben können und Bildunterschriften unter veröffentlichten Bildern mit einem abgestimmten Formatierungs- und Barrierefreiheitsverhalten erscheinen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.