IRIDL server-side processing

Server-side processing:
- [x] select and aggregate `lead_time` `L` and `forecast_time` `S`
- [x] regrid `X` and `Y` to 1.5 deg grid
- [x] SubX intake catalog biweekly 
- [x] requires unreleased climetlab_s2s_ai_challenge plugin
- [ ] init frequency forecast: keep as todo
- [x] IRIDL cat S2S 
- [x] IRIDL obs regrid
- [x] check proper lead ints or floats to match my int lead_time

closes #9

See merge request !10

redo renku datasets

Closes #5, #3, and s2s-ai-challenge#22

See merge request !14

renku dataset add -o s2s-ai-challenge data/hindcast-like-observations_2000-2019_biweekly_determin...

CI notebooks

- run verification notebook in CI
- use docker image pushed
- should only run for this repo and not automatically in all forks: add check if repo name `aaron.spring/s2s-ai-challenge-template` only

closes #8

See merge request !11

Co-authored-by: tao.sun

Update scripts.py, clip(-10, 1) and penalize

See merge request aaron.spring/s2s-ai-challenge-template!9

fix typo in safeguards

See merge request aaron.spring/s2s-ai-challenge-template!8

Update environment.yml

See merge request aaron.spring/s2s-ai-challenge-template!7

showcase different data access options

Closes #1

See merge request aaron.spring/s2s-ai-challenge-template!2

Update instructions

See merge request aaron.spring/s2s-ai-challenge-template!6

renku datasets and initial notebooks

See merge request aaron.spring/s2s-ai-challenge-template!4

renku dataset add --create hindcast-like-observations_2000-2019_biweekly_tercile-edges data/hindc...