chore: update template examples for clarity and accuracy

[42atomys]

Description

This pull request update all documentation examples and add a tool to validate each documentation examples on CI to prevent any error on documentation since now.

Changes

• Add a tool task test-doc to test all documentation examples to validate the synthax and the output. Act as second e2e testing.
• Validate and update all examples according to the result of the docvalidator.

Fixes #78

Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the code style of this project.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation accordingly.
• This change requires a change to the documentation on the website.

[codecov]

Codecov Report

Attention: Patch coverage is 92.04545% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tools/docvalidator/main.go	85.2%	14 Missing ⚠️
tools/docvalidator/filesystem.go	0.0%	4 Missing ⚠️
tools/docvalidator/parsing.go	97.5%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
pesticide/template_test_helpers.go	100.0% <100.0%> (ø)
tools/docvalidator/processing.go	100.0% <100.0%> (ø)
tools/docvalidator/parsing.go	97.5% <97.5%> (ø)
tools/docvalidator/filesystem.go	0.0% <0.0%> (ø)
tools/docvalidator/main.go	85.2% <85.2%> (ø)

[42atomys]

@ccoVeille I remove time hack according to #94