Updated docs with the current versions of node and dotnet

[misrarah]

Updated docs with the current versions of node 20 and dotnet sdk 8
added a global.json file to enforce the SDK

[kruplm]

Hi @misrarah, thank you for the contribution.

The documentation hasn't been updated to contain the current version of .NET, because we haven't upgraded this project to .NET 8 yet.
It's in our pipeline and something we definitely want to do before our next release.

Also, please note that next to your contribution you need to commit a DCO

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.69%. Comparing base (cf6ca78) to head (09e1ab4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #867      +/-   ##
==========================================
+ Coverage   67.65%   67.69%   +0.03%     
==========================================
  Files         300      300              
  Lines        8982     8982              
  Branches      935     1031      +96     
==========================================
+ Hits         6077     6080       +3     
+ Misses       2689     2686       -3     
  Partials      216      216              

see 6 files with indirect coverage changes