minor refactor

TODO:

- annotation
- real space not yet available
- nehuba status panel busted
- check swc works

generally working with the following caveats:

- fsaverage busted
- annotation not yet working
- colin27 busted
- real space interpolation values not yet available
- (as a result of above) nehuba status panel not yet working

ALSO TO CHECK:
- swc

maint: update CI version
maint: remove deprecated use of cmpfactory

... persistence)
maint: added markdown descriptor for slice view quick starter guide
fix: fixed neuron messing, passing message to api service if not found
fix: api method typos

maint: external precomputed layer now fetches and sets transform

feat: allow point assmnt result export as CSV

interactive (atlas) viewer -> siibra explorer
HBP -> EBRAINS