Support JSON Schema

[ya7010]

Problem

Is it possible to generate a JSON Schema for book.toml and register it with SchemaStore?

An issue regarding this has been raised in Tombi, but I believe it would be better to handle this on the mdbook side.

tombi-toml/tombi#1944

Proposed Solution

We will use schemars to enable the automatic generation of a JSON Schema from a struct that parses book.toml.

Notes

No response