render benchmarks results

[grisumbras]

This PR uses the script that's based on the one from bench/results.html to draw benchmarks results in canvas elements, rather than embedded images. The idea is to eventually point it to latests release's benchmarks result data.

[cppalliance-bot]

An automated preview of the documentation is available at https://870.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[codecov[bot]]

Codecov Report

Merging #870 (0e548f1) into develop (4d4d5fc) will decrease coverage by 0.01%. The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #870      +/-   ##
===========================================
- Coverage    99.19%   99.19%   -0.01%     
===========================================
  Files           70       70              
  Lines         6853     6851       -2     
===========================================
- Hits          6798     6796       -2     
  Misses          55       55              

Impacted Files	Coverage Δ
include/boost/json/impl/error.ipp	100.00% <0.00%> (ø)

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[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/870/pullrequest.html