Rename AutoGen to AG2

[kumaranvpl]

Description

Fixes #652

Type of change

• Documentation (typos, code examples, or any documentation updates)
• Bug fix (a non-breaking change that resolves an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a fix or feature that would disrupt existing functionality)
• This change requires a documentation update

Checklist

• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• I have included code examples to illustrate the modifications

[Copilot]

Pull Request Overview

This PR renames all references of AutoGen to AG2 and updates associated documentation links accordingly.

• Rebrand AutoGen as AG2 (formerly AutoGen) in documentation and README
• Update repository URLs to point to the AG2 repository
• Maintain consistency in feature descriptions and supported runtime information

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/docs/en/features.md	Updated references and links from AutoGen to AG2 (formerly AutoGen)
README.md	Updated references and links from AutoGen to AG2 (formerly AutoGen)

Comments suppressed due to low confidence (1)

docs/docs/en/features.md:124

• [nitpick] Consider revising 'other network provider' to 'other network providers' for improved grammatical clarity.

We are actively working on expanding FastAgency’s capabilities. In addition to supporting AG2 (formerly AutoGen), we plan to integrate support for other frameworks, other network provider and other UI frameworks.