Link to the new Anaconda DSP instance

[maximlt]

• Link to the new Anaconda DSP instance at https://holoviz.dsp.anaconda.com
• Separate the dev environment (with pyviz/label/dev and bokeh/label/dev) with the prod environment
• Fix a couple of old links

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.65%. Comparing base (4581b4a) to head (c67eea6).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6413       +/-   ##
===========================================
- Coverage   82.03%   71.65%   -10.39%     
===========================================
  Files         305      305               
  Lines       45730    45730               
===========================================
- Hits        37515    32766     -4749     
- Misses       8215    12964     +4749     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	71.65% <ø> (+0.01%)	⬆️

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