rename Prelude to Base and split Base.Types (#254)

* add a script to create the subpackages

* move to @rescript-webapi npm namespace

* remove unused JS files

* split Prelude.Types into multiple files

* bring back tests

* format

* rename prelude to base

* disable warning 30

* format

Author: tsnobip

docs/content/docs/contributing/api-modelling.mdx

@@ -88,9 +88,8 @@ mutable fillStyle: fillStyle
 When we wish to read and write the `fillStyle` property, we can use a helper module to lift the type to an actual ReScript variant:
 
 export const fillStyleModule = `
-open Prelude
-open CanvasAPI
-open DOMAPI
+open WebApiCanvas
+open WebApiDOM
 
 external fromString: string => fillStyle = "%identity"
 external fromCanvasGradient: canvasGradient => fillStyle = "%identity"

docs/content/docs/philosophy.mdx

@@ -50,12 +50,12 @@ let element: element = document->Document.createElement( ~localName = "div")
 let node: node = element->Element.asNode
 ```
 
-Any other conversions can be performed using the `Prelude.unsafeConversation` helper. This should be done with caution, as it can lead to runtime errors.
+Any other conversions can be performed using the `Base.unsafeConversation` helper. This should be done with caution, as it can lead to runtime errors.
 
 ```ReScript
 open WebAPI
 
 let element: element = document->Document.createElement( ~localName = "div")
 // This is potentially unsafe, as the type system cannot guarantee the conversion
-let divElement: htmlDivElement = element->Prelude.unsafeConversation
+let divElement: htmlDivElement = element->Base.unsafeConversation
 ```