[Doc-Gen Tool] Group declarations based on their kind

[SupunS]

Description

Re-organize the generated documentation such that similar kinds of declarations are grouped together.

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #984 (644e398) into master (91c9cdb) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #984      +/-   ##
==========================================
+ Coverage   75.43%   75.46%   +0.03%     
==========================================
  Files         268      268              
  Lines       32829    32870      +41     
==========================================
+ Hits        24764    24805      +41     
  Misses       6929     6929              
  Partials     1136     1136              

Flag	Coverage Δ
unittests	75.46% <ø> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/interpreter/function.go	56.00% <0.00%> (-1.45%)	⬇️
runtime/interpreter/deployed_contract.go	32.00% <0.00%> (-1.34%)	⬇️
runtime/interpreter/value.go	77.44% <0.00%> (+0.17%)	⬆️
runtime/interpreter/block.go	74.19% <0.00%> (+0.86%)	⬆️
runtime/interpreter/errors.go	26.59% <0.00%> (+5.31%)	⬆️

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[turbolent]

Nice!