chore(tsconfig): abort on invalid json content

[legendecas]

Which problem is this PR solving?

Fixes #3566 (comment)

Also,

• renames root tsconfig.es5.json to be tsconfig.base.es5.json as it is not an entry tsconfig.
• moves root style.md to doc/contributing to reduce the number of files in the root directory.

Type of change

• Internal cleanup

Checklist:

• Followed the style guidelines of this project

[codecov]

Codecov Report

Merging #3578 (6d7b6e9) into main (2a76d88) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3578   +/-   ##
=======================================
  Coverage   93.90%   93.90%           
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  Files         255      255           
  Lines        7763     7763           
  Branches     1613     1613           
=======================================
  Hits         7290     7290           
  Misses        473      473