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Remove cache warming documentation (#20269) 

The cache warming strategies perform unauthorized `GET` requests that are redirected to the login page #9597
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@ -42,26 +42,6 @@ defined in `DATA_CACHE_CONFIG`.
## Celery beat
Superset has a Celery task that will periodically warm up the cache based on different strategies.
To use it, add the following to the `CELERYBEAT_SCHEDULE` section in `config.py`:
```python
CELERYBEAT_SCHEDULE = {
'cache-warmup-hourly': {
'task': 'cache-warmup',
'schedule': crontab(minute=0, hour='*'), # hourly
'kwargs': {
'strategy_name': 'top_n_dashboards',
'top_n': 5,
'since': '7 days ago',
},
},
}
```
This will cache all the charts in the top 5 most popular dashboards every hour. For other
strategies, check the `superset/tasks/cache.py` file.
### Caching Thumbnails
This is an optional feature that can be turned on by activating it’s feature flag on config: