Improve the bundle list more visibility

[jhlegarreta]

The bundle names contained in the atlas are used across different places in the SlicerDMRI/ORG-Atlas/WMA ecosystem. The bundles correspond to the ones in Table 3 in https://doi.org/10.1016/j.neuroimage.2018.06.027.

The bundles can be found in this ORG-Atlas repository documentation:
https://github.com/SlicerDMRI/ORG-Atlases/blob/master/Tracts-in-ORG-800FC-100HCP.md

Which, in turn, is referenced in the SlicerDMRI documentation website:
https://github.com/SlicerDMRI/slicerdmri.github.io/blob/master/atlas/index.md

Rendered in:
http://dmri.slicer.org/atlases/

At the same time, WMA contains a hard-coded list/dictionary of such bundles:
https://github.com/SlicerDMRI/whitematteranalysis/blob/9850ab110521f3ce7d9b575e084fa227da9bbf6b/bin/wm_append_clusters_to_anatomical_tracts.py#L99C14-L99C14

And a PR was submitted to list the bundles in the WMA repository:
SlicerDMRI/whitematteranalysis#123

Ideally, all this information should dwell at a single place (a JSON, CSV or Python file), and be pulled/scraped from there, including into the website documentation pages. Its discoverability and visibility should also be improved.