Fixed remote and added testing documentation.

[filipecosta90]

• Simplified CI rules
• Added coverage and test rules to makefile
• Fixed remote documentation
• Added release drafter automation
• Added linter rules ( make lint, make format )
• Fixed two small null dereference warnings raised by running fbinfer
• Added perf make rules to enable easier on CPU bottleneck findings...

[codecov[bot]]

Codecov Report

Merging #1 (42f8b5a) into master (3fbb66e) will increase coverage by 0.21%. The diff coverage is 93.43%.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
+ Coverage   93.82%   94.03%   +0.21%     
==========================================
  Files           1        1              
  Lines         162      151      -11     
==========================================
- Hits          152      142      -10     
+ Misses         10        9       -1     

Impacted Files	Coverage Δ
src/tdigest.c	94.03% <93.43%> (+0.21%)	:arrow_up:

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