Update index.md, added antirez/ds4

[angeloz]

Please confirm this pull request meets the following requirements:

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Editing an existing topic or collection

I'm suggesting these edits to an existing topic or collection:

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Curating a new topic or collection

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Please replace this line with an explanation of your proposed changes.

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[github-actions]

Maintainer triage

Collection made-in-italy

Item	Stars	Last push	Owner type	Notes
fastify/fastify	37,026	2026-08-23	Organization	–
immuni-app/.github	81	2024-06-08	Organization	–
italia/covid19-opendata-vaccini	521	2026-08-21	Organization	–
middyjs/middy	3,904	2026-08-21	Organization	–
nodejs/undici	7,681	2026-08-24	Organization	–
elastic/elasticsearch-js	5,291	2026-08-17	Organization	–
morrolinux/simple-ehm	232	2024-02-23	User	–
micheleriva/coronablocker	31	2020-11-04	User	–
HospitalRun/hospitalrun	989	2021-02-05	Organization	archived
histolab/histolab	463	2026-08-17	Organization	–
strawberry-graphql/strawberry	4,706	2026-08-23	Organization	–
notable/notable	23,500	2024-06-21	Organization	–
espanso/espanso	14,346	2026-08-24	Organization	–
eciavatta/caronte	652	2022-12-07	User	–
Schroedinger-Hat/ImageGoNord-Web	936	2025-07-10	Organization	–
stoplightio/prism	5,012	2026-08-13	Organization	–
ercole-io/ercole	151	2026-03-19	Organization	–
exa-studio/ApiVault	681	2024-09-08	Organization	–
antirez/ds4	21,707	2026-08-23	User	–