- The string encoding and errors sections move to the reference page
- The metadata files section moves to the introduction page
- The language codes section is already detailed in a C++ header doc comment
- The caching section is already detailed in C++ header doc comments
- The performance section is outdated and isn't worth keeping once updated.
Rewrite it as reStructuredText so that it can be hosted alongside the
API documentation on Read The Docs, which allows linking to WIP syntax
documentation.