remove depreacted typography API

.changeset/fluffy-peaches-punch.md

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+---
+'@guardian/source': major
+---
+
+Removes deprecated typography API.
+
+In `@guardian/[email protected]` (2024-04-07), we added new [web typography presets](https://guardian.github.io/storybooks/?path=/story/source_foundations-typography--presets) to standardise on the typographic language used by Design, and deprecated the old typography API.
+
+This release removes that old API, in order to simplify the ongoing maintenance of the library.
+
+The following exports have been removed:
+
+- `titlepiece`
+- `headline`
+- `body`
+- `textSans`
+- `titlepieceSizes`
+- `headlineSizes`
+- `bodySizes`
+- `textSansSizes`
+- `remTitlepieceSizes`
+- `remHeadlineSizes`
+- `remBodySizes`
+- `remTextSansSizes`
+- `fonts`
+- `fontWeights`
+- `lineHeights`
+- `bodyObjectStyles`
+- `headlineObjectStyles`
+- `textSansObjectStyles`
+- `titlepieceObjectStyles`
+
+along with the following `type` exports:
+
+- `ScaleUnit`
+- `Category`
+- `LineHeight`
+- `FontWeight`
+- `FontStyle`
+- `FontWeightDefinition`
+- `Option`
+- `TypographySizes`
+- `TypographyStyles`
+- `TitlepieceSizes`
+- `HeadlineSizes`
+- `BodySizes`
+- `TextSansSizes`
+- `Fs`
+- `FontScaleFunction`
+- `FontScaleFunctionStr`
+- `FontScaleArgs`
+
+_If you cannot map existing uses of the old API to the new presets, please check which preset you should use with a designer._