Refactor

[txaty]

Major changes:

1. Make default hash functions public;
2. Deprecate NonDuplicates configuration. Now avoiding duplicates by generating dummy nodes with random hash values is abandoned;
3. Refactor README;
4. Refactor .gitignore;
5. Refactor Makefile.

[codecov[bot]]

Codecov Report

Merging #26 (e75b479) into main (324a126) will increase coverage by 3.22%. The diff coverage is 96.62%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   93.93%   97.15%   +3.22%     
==========================================
  Files           2        2              
  Lines         445      422      -23     
==========================================
- Hits          418      410       -8     
+ Misses         18        8      -10     
+ Partials        9        4       -5     

Impacted Files	Coverage Δ
merkle_tree.go	97.10% <96.47%> (+3.27%)	:arrow_up:
default_hash.go	100.00% <100.00%> (ø)

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