Deno CLI special remote implementation

[nellh]

• Ports our existing special remote to Deno.
• Adds documentation for git usage replacing the Node.js recommendations.
• Updates to latest bids-validator (2.0.1).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 139 lines in your changes missing coverage. Please review.

Project coverage is 46.52%. Comparing base (dc8dd5c) to head (64d8fb9).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
cli/src/commands/special-remote.ts	0.00%	119 Missing and 1 partial ⚠️
cli/mod.ts	0.00%	6 Missing ⚠️
cli/src/worker/git.ts	0.00%	5 Missing ⚠️
cli/src/commands/git-credential.ts	0.00%	4 Missing ⚠️
cli/src/options.ts	0.00%	3 Missing ⚠️
cli/src/worker/transferKey.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3273      +/-   ##
==========================================
- Coverage   46.67%   46.52%   -0.16%     
==========================================
  Files         609      610       +1     
  Lines       38734    38865     +131     
  Branches     1232     1233       +1     
==========================================
  Hits        18080    18080              
- Misses      20459    20589     +130     
- Partials      195      196       +1     

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