Remove debug panel in ipyvolume viewers

[Carifio24]

This PR removes the side debug panel in the ipyvolume viewers. Thanks to @maartenbreddels for the tip on how to do this.

This also increases the default size of the figure itself from 400 -> 600px, as I couldn't see the entire bounding box with a 400px width. Happy to increase the size further if desired.

[Carifio24]

Just for context, here's what the view looked like at 400px:

and at 600px:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.04%. Comparing base (488287d) to head (1d9c74e).
Report is 20 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage   86.04%   86.04%           
=======================================
  Files          90       90           
  Lines        5223     5224    +1     
=======================================
+ Hits         4494     4495    +1     
  Misses        729      729           

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[astrofrog]

Thank you!