Doc: Update installation under conda

[dweindl]

• anaconda -> conda (to include miniconda)
• not recommended
• Include installation hint from Fix to conda installation. #2402. Closes Fix to conda installation. #2402.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.08%. Comparing base (f8ce650) to head (7eca594).
Report is 33 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (f8ce650) and HEAD (7eca594). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (f8ce650)	HEAD (7eca594)
python	2	1
cpp	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #2474       +/-   ##
============================================
- Coverage    76.20%   34.08%   -42.13%     
============================================
  Files          319      319               
  Lines        20772    20468      -304     
  Branches      1462     1460        -2     
============================================
- Hits         15830     6977     -8853     
- Misses        4938    13476     +8538     
- Partials         4       15       +11     

Flag	Coverage Δ
cpp	?
cpp_python	34.08% <ø> (ø)
python	31.43% <ø> (-40.73%)	⬇️

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see 243 files with indirect coverage changes