Documentation update

[andrey-kashcheev]

• Migrated dev guide to have it here on GitHub
• Updated existing docs to point to the new guide
• Updated links to HERE docs portal

Relates-To: DATASDK-92, DATASDK-99

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.27%. Comparing base (9ba2a00) to head (b8ba022).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1703      +/-   ##
==========================================
- Coverage   80.28%   80.27%   -0.01%     
==========================================
  Files         356      356              
  Lines       14281    14280       -1     
  Branches     1563     1563              
==========================================
- Hits        11465    11463       -2     
- Misses       2184     2186       +2     
+ Partials      632      631       -1     

see 2 files with indirect coverage changes

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