xcube server developer guide

[forman]

[Description of PR]

Checklist:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/source/*
• Changes documented in CHANGES.md
• AppVeyor CI passes
• Test coverage remains or increases (target 100%)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3bec012) 93.43% compared to head (db2bde6) 93.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #801   +/-   ##
=======================================
  Coverage   93.43%   93.43%           
=======================================
  Files         453      453           
  Lines       35510    35510           
=======================================
  Hits        33180    33180           
  Misses       2330     2330           

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