Changing order of the rich text editor buttons + delete the image but… (#187)

## Description

In rich text editor:
- removing default image button (as we already have a custom one)
- moving "embed" button as the first one

## Screenshot (optional)

<img width="1903" height="906" alt="image"
src="https://github.com/user-attachments/assets/28311b3b-25da-48e5-bbdd-95721301598f"
/>

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Author: PothieuG

tina/collection/rule.tsx

@@ -133,6 +133,7 @@ const Rule: Collection = {
       label: "Body",
       isBody: true,
       templates: embedTemplates,
+      toolbarOverride: ['embed', 'heading', 'link', 'quote', 'ul', 'ol', 'bold', 'italic', 'code', 'codeBlock', 'mermaid', 'table', 'raw']
     },
     ...historyFields
   ],