fix: resolve all markdown linting errors

[mombe090]

Summary

• Fixed all 912 markdown linting errors across the project, achieving 100% compliance with markdownlint rules
• Corrected heading hierarchies, table formatting, empty links, and spacing issues in 13 markdown files (blog posts, drafts, and documentation)

[Copilot]

Pull Request Overview

This pull request focuses on formatting and consistency improvements across multiple blog posts written in French. The changes primarily involve adding blank lines for better readability, fixing image alt text descriptions, standardizing heading levels, and removing trailing whitespace.

Key Changes

• Improved markdown formatting with consistent blank line spacing between sections
• Added descriptive alt text to all images (replacing empty alt attributes)
• Standardized heading hierarchy (converting some h3/h5 headings to h2)
• Removed extraneous blank lines and trailing whitespace

Reviewed Changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
_posts/2025-08-26-old-mac-mid-2015-back-to-life-with-arch.md	Removed blank lines and fixed list numbering
_posts/2025-02-24-aws-serverless-architecture-part1.md	Added blank lines, fixed image alt text, corrected inline code formatting, and standardized headings
_posts/2025-02-03-argocd-pihole-certm-externald-metallb.md	Added blank lines, converted emphasis markers, added image alt text, and restructured list items
_posts/2025-01-21-opentofu-proxmox-talos.md	Added blank lines and image alt text throughout
_posts/2025-01-11-ollama-continue-free-copilot.md	Added blank lines and image alt text
_posts/2025-01-04-k3s.md	Restructured lists, added blank lines, changed h4 to h3
_posts/2024-12-29-headlamp.md	Added blank lines and reorganized nested list structures
_posts/2024-12-19-kind.md	Added blank lines and changed h4 to h3
_plugins/orbstack.md	Removed trailing blank line
_drafts/about.md	Added blank lines
_drafts/2025-03-15-longhorn-vault-cloudnativepg-pgadmin.md	Comprehensive formatting fixes including blank lines, image alt text, and heading changes
README.md	Added blank line
.kiro/specs/multilingual-blog-support/design.md	Minor whitespace fix

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[Copilot]

[nitpick] Changed code fence language from 'bash' to 'text' for non-executable output. While this is more semantically correct for displaying output rather than commands, ensure consistency across the document for similar output blocks.