Fix EducationalEvent timezone: +00:00 → +01:00 (IST in October)

Problem

In layouts/partials/structured-data-schedule.html, the startDate and endDate of every EducationalEvent use a hardcoded +00:00 UTC offset:

```
"startDate": "{{ $year }}-{{ $month }}-{{ $dayNum }}T{{ $time }}:00+00:00"
```

PyCon Ireland 2026 is on 17 October — Ireland is on IST (Irish Standard Time = UTC+1) in October. The clocks go back on 25 October 2026, so the conference is definitely in IST.

The main Event schema in structured-data.html already uses +01:00 (correct). The session schemas are 1 hour off.

Fix

Change the hardcoded offset in structured-data-schedule.html from +00:00 to +01:00, or better: add a timezone param to hugo.toml and reference it in the template.

```toml

hugo.toml

eventTimezone = "+01:00"
```

Files to change

• layouts/partials/structured-data-schedule.html
• Optionally hugo.toml (add eventTimezone param)

Start with layouts/partials/structured-data-schedule.html and compare its EducationalEvent dates with the +01:00 offset in structured-data.html. Change the session schema offset, or use the optional eventTimezone parameter in hugo.toml; done means the startDate and endDate values use +01:00 for the October conference.