message: docs: Update release notes with conversion changes
diff: # Community Solid Server release notes
  +## v3.0.0
  +### New features
  +...
  +
  +### Configuration changes
  +You might need to make changes to your v2 configuration if you use a custom config.
  +
  +The following changes pertain to the imports in the default configs:
  +- ...
  +
  +The following changes are relevant for v2 custom configs that replaced certain features.
  +- Conversion has been simplified so most converters are part of the conversion chain:
  + - `/util/representation-conversion/default.json`
  +
  +### Interface changes
  +These changes are relevant if you wrote custom modules for the server that depend on existing interfaces.
  +- `TypedRepresentationConverter` function signatures changed
  + and base functionality moved to `BaseTypedRepresentationConverter`
  +
  ## v2.0.0
  ### New features
  - Pod owners always have Control access to resources stored in their Pod.
  