Add common languages to highlightjs (#953)
* Add common languages to highlightjs
Change the languages highlighted in code blocks:
- Add C and Javascript, which are commonly used with OCaml.
- Add Json, which is used in several major libraries.
- Add SQL and GraphQL, for which popular libraries exist.
- Add Shell Session which seems most useful with Mdx.
The size of highlightjs grows from 33KB to 54KB.
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