Markdown Lint fixes and Spelling by Grammarly

[jbrejner]

No description provided.

[Copilot]

Pull Request Overview

This PR performs markdown linting fixes and spelling corrections suggested by Grammarly across multiple documentation and configuration files in the ArgoCD training repository. The changes improve readability, correct grammatical errors, and ensure consistent markdown formatting throughout the documentation.

Key changes include:

• Grammar and spelling corrections in exercise documentation
• Markdown formatting improvements and consistency fixes
• Addition of markdownlint configuration file to enforce standards

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
trainer/exercise-template.md	Grammar corrections and spelling fixes in exercise template
setup.md	Formatting improvements, grammar fixes, and markdown structure updates
sealed-secrets.md	Grammar corrections and bullet point formatting
projects.md	Grammar fixes, formatting improvements, and list structure updates
intro.md	Extensive formatting changes from asterisks to dashes for lists and grammar corrections
examples/folder-structures/folder-per-env/README.md	Added missing line breaks for proper list formatting
examples/folder-structures/folder-per-env-helm-enabled/README.md	Header formatting fixes from # to ##
examples/folder-structures/README.md	Added proper header formatting
argocd-and-helm.md	Grammar corrections and formatting improvements
applicationsets.md	Grammar fixes and list formatting consistency
app-of-apps.md	Grammar corrections and formatting improvements
README.md	Grammar improvements and link formatting fixes
.markdownlint.json	New configuration file for markdown linting rules

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