Adds language model tool that creates new spfx projects. Closes #707, #705

[Adam-it]

🎯 Aim

The aim of this PR is to depreacte the chat participant and remove the /new chat command and refactor it to a dedicated language model tool that will execute the best yo command to create and SPFx project for user prompt

📷 Result

✅ What was done

• Removes the new chat participant command
• Updates docs and readme
• Adds a new langauge model tool that createst he best yo command for user prompt and executes it

🔗 Related issue

Closes #707, #705

[Adam-it]

just noticed when doing different stuf that we should also remove

vscode-viva/src/panels/CommandPanel.ts

Line 365 in 62b5666

actionCommands.push(new ActionTreeItem('Use @spfx in GitHub Copilot ', '', { name: 'copilot', custom: false }, undefined, Commands.openCopilot));

and

vscode-viva/src/panels/CommandPanel.ts

Line 376 in 62b5666

actionCommands.push(new ActionTreeItem('Use @spfx in GitHub Copilot ', '', { name: 'copilot', custom: false }, undefined, Commands.openCopilot));

and
https://github.com/pnp/vscode-viva/blob/main/src/services/actions/CopilotActions.ts

with this change

[Adam-it]

just noticed when doing different stuf that we should also remove

vscode-viva/src/panels/CommandPanel.ts

Line 365 in 62b5666

actionCommands.push(new ActionTreeItem('Use @spfx in GitHub Copilot ', '', { name: 'copilot', custom: false }, undefined, Commands.openCopilot));

and

vscode-viva/src/panels/CommandPanel.ts

Line 376 in 62b5666

actionCommands.push(new ActionTreeItem('Use @spfx in GitHub Copilot ', '', { name: 'copilot', custom: false }, undefined, Commands.openCopilot));

and https://github.com/pnp/vscode-viva/blob/main/src/services/actions/CopilotActions.ts

with this change

done ✅