📊 covid: explorer improvements

[lucasrodes]

[tracking issue]

• make explorer public
• change download link

[owidbot]

Quick links (staging server): Site	Admin	Wizard

Login: ssh owid@staging-site-covid-explorer-2

chart-diff: ✅

No charts for review.

data-diff: ✅ No differences found

```diff Legend: +New ~Modified -Removed =Identical Details Hint: Run this locally with etl diff REMOTE data/ --include yourdataset --verbose --snippet ``` Automatically updated datasets matching _weekly_wildfires|excess_mortality|covid|fluid|flunet|country_profile|garden/ihme_gbd/2019/gbd_risk_ are not included

Edited: 2024-08-20 23:01:17 UTC Execution time: 11.79 seconds