The namespace for the serialization classes has been updated from `Htmxor.Configuration.Serialization` to `Htmxor.Serialization`. This change affects multiple files including `HtmxHeadOutlet.cs`, `HtmxResponse.cs`, and `HtmxJsonSerializerContext.cs`.

Removed an unnecessary import from the HtmxConfig file, specifically the Configuration.Serialization namespace which was not being used. This helps to keep the codebase clean and efficient.

Removed the unnecessary Htmxor.Configuration import from the _Imports.razor file in the HtmxBlazorSSR project. This simplifies the code and reduces dependencies.