Add Extra Network Model Description

[one111eric]

Describe what this pull request is trying to achieve.

Add a textarea to allow user to add or replace extra-network model despcription from front-end UI.

Environment this was tested in

List the environment you have developed / tested this on. As per the contributing page, changes should be able to work on Windows out of the box.

• OS: Windows
• Browser: Chrome
• Graphics card: [e.g. NVIDIA RTX 3080 12GB]

Screenshots or videos of your changes

Gif Video

Added a read description button to read:

This is required for anything that touches the user interface.