source data for example_data_viewers/mario no longer available

**Describe the bug**
The links to dropbox locations for the 10MB `timelines.csv` and 300MB `mario_data.csv` are broken.

**To Reproduce**
Try to access either:

https://www.dropbox.com/s/y161aj5eadd1xsf/timelines.csv?dl=0

or

https://www.dropbox.com/s/g2453fnfjg2rrjz/mario_data.csv?dl=0

**Expected behavior**
Download of CSV file requested when links used.

**Details:**
(none of this is relevant to problem, but sharing anyway in case you track these things)

- Operating System: MacOS 13.6.3
- Python version (``python --version``): 3.9.18
- Glue version (``glue --version``): 1.2.4
- How you installed glue:
```
conda create --name py39_glueviz python=3.9 glueviz vispy=0.10
```