Add a new blog for Fluent Bit Operator on fluentbit.io

[FeynmanZhou]

As the Fluent Bit Operator has been accepted as a sub-project of the Fluent community last week, shall we write a new blog to announce this migration on fluentbit.io/blogs?

If possible, we will draft a Pull Request to add the content to this repository.

Thanks.

Feynman

[agup006]

+1 to blog, we should also look at some documentation - PR once ready will be highly appreciated!