Documentation & apidoc refactor 5.0

[srknzl]

• Remove any imdg reference, change links to point to new documentation
• Typo fixes
• Changes in api doc, IList is changes according to java's List documentation
• Add check-markdown-links script to be able to easily check broken links while developing, add it to contributing.md
• There should not be any code changes at all in this pr

closes #1051
closes #1049
closes #1048

[codecov]

Codecov Report

Merging #1062 (8da07a4) into master (663bb4f) will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1062      +/-   ##
==========================================
- Coverage   92.63%   92.34%   -0.29%     
==========================================
  Files         432      432              
  Lines       16734    16734              
  Branches     1036     1036              
==========================================
- Hits        15501    15453      -48     
- Misses        968     1012      +44     
- Partials      265      269       +4     

Impacted Files	Coverage Δ
src/core/RestValue.ts	86.66% <ø> (ø)
src/core/SimpleEntryView.ts	100.00% <ø> (ø)
src/proxy/ItemListener.ts	100.00% <ø> (ø)
src/util/IndexUtil.ts	61.11% <ø> (ø)
src/network/ConnectionManager.ts	81.12% <0.00%> (-6.18%)	⬇️
src/config/ConfigBuilder.ts	93.95% <0.00%> (-2.85%)	⬇️
src/util/Util.ts	87.09% <0.00%> (-1.30%)	⬇️
src/core/HazelcastError.ts	65.55% <0.00%> (-1.12%)	⬇️
src/protocol/ErrorFactory.ts	64.96% <0.00%> (-0.73%)	⬇️
src/invocation/ClusterService.ts	93.61% <0.00%> (-0.71%)	⬇️

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