Add web-page-design-mode extension

[danulqua]

Description

This extension toggles the document.designMode property on the web page between "on" and "off" values that control whether the entire document is editable. It allows for easy content editing for development, design, or any other purposes.

Screencast

https://github.com/user-attachments/assets/f79d70b7-1257-410e-9260-5933e72dbc6f

Checklist

• [x] I read the extension guidelines
• [x] I read the documentation about publishing
• [x] I ran npm run build and tested this distribution build in Raycast
• [x] I checked that files in the assets folder are used by the extension itself
• [x] I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! :rocket:

You can expect an initial review within five business days.

Once the PR is approved and merged, the extension will be available on our Store.