remove process_strategy and mermaid

[ekneg54]

Removal of ProcessorStrategy

• implements additional complexity
• since implementation no other strategy was implemented
• seems to be not needed

Removal of Mermaid from docs

• diagrams are pretty old
• mermaid does not work in airgapped environments

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (37e2a4d) 92.28% compared to head (c11cf4b) 92.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #451      +/-   ##
==========================================
+ Coverage   92.28%   92.36%   +0.07%     
==========================================
  Files         135      134       -1     
  Lines        9553     9531      -22     
==========================================
- Hits         8816     8803      -13     
+ Misses        737      728       -9     

Files	Coverage Δ
logprep/abc/processor.py	99.40% <100.00%> (+0.08%)	⬆️
logprep/run_logprep.py	89.47% <100.00%> (-0.21%)	⬇️

... and 1 file with indirect coverage changes

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