Introducing AutoAnny: A New Discord Bot Built with AutoGen (#1501)

* Move app from private repo to AutoGen

* Add icon

* Draft initial blog

* Update samples/apps/auto-anny/bot.py

Co-authored-by: Davor Runje <davor@airt.ai>

* Update README.md

* Allow specifying repo name

* Log messages and reactions to messages

* Update readme

* Update blog

* Update blog

* Update website and readme

* Extend examples

* Improve blog

* Update website/blog/2024-02-02-AutoAnny/index.mdx

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

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Co-authored-by: Davor Runje <davor@airt.ai>
Co-authored-by: Chi Wang <wang.chi@microsoft.com>