fix: the wrong text is inserted after uploading an image

[ppodds]

🔗 Linked issue

Resolves #334. Resolves #574.

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The original code inserted a link text after uploading the image. This pull request will correct it and ensure that the image name is respected when the file extension is included, particularly for known image extensions.

[erossini]

I saw your code. Thank you, it fixed my issue. If you like, here the full code https://github.com/erossini/EasyMarkdownEditor