[CSUB-886] Remove PoW Mining References

[pLabarta]

Description of proposed changes

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Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[pLabarta]

Note:

Since the Miner Setup guide was removed and the Node Setup guide was modified. We need to add references to the current docs and update the Node Setup guide output example & instructions to run a persistent local chain.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3baf819) 72.53% compared to head (f2a2b1c) 72.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1505   +/-   ##
=======================================
  Coverage   72.53%   72.53%           
=======================================
  Files         107      107           
  Lines       12561    12561           
  Branches      128      128           
=======================================
  Hits         9111     9111           
  Misses       3440     3440           
  Partials       10       10           

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[github-actions]

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[atodorov]

Minor changes requested.