Doc: extend scatter search documentation

[dweindl]

Add example, background, cross-references, ...

👀 https://pypesto--1506.org.readthedocs.build/en/1506/api/pypesto.optimize.html#pypesto.optimize.ESSOptimizer

👀 https://pypesto--1506.org.readthedocs.build/en/1506/api/pypesto.optimize.html#pypesto.optimize.SacessOptimizer

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.05%. Comparing base (e62c2cb) to head (473992e).

Files with missing lines	Patch %	Lines
pypesto/optimize/ess/ess.py	92.30%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1506      +/-   ##
===========================================
- Coverage    81.06%   81.05%   -0.01%     
===========================================
  Files          163      163              
  Lines        13955    13959       +4     
===========================================
+ Hits         11313    11315       +2     
- Misses        2642     2644       +2     

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[dilpath]

Thanks!