docs: Star website: API index page for pg-sql2 has no content

[jemgillam]

Feature description

API index page at https://star.graphile.org/pg-sql2/api/ has no content but is will be linked to from other documentation sites

Motivating example

Linked to from https://postgraphile.org/postgraphile/current/make-extend-schema-plugin

Breaking changes

NA

Supporting development

I [tick all that apply]:

• am interested in building this feature myself
• am interested in collaborating on building this feature
• am willing to help testing this feature before it's released
• am willing to write a test-driven test suite for this feature (before it exists)
• am a Graphile sponsor ❤️
• have an active support or consultancy contract with Graphile
• I am the other half of the Graphile maintainer team 😉

[benjie]

Here's a good reference file for doing so: https://unpkg.com/browse/pg-sql2@5.0.0-beta.7/dist/index.d.ts