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JavaScript introduction lesson: Fix markdown linting errors and improve lesson structure

Enhanced PR Description:

Because

The JavaScript course introduction lesson (how_this_course_will_work.md) contained multiple markdown linting violations that affected curriculum consistency and accessibility. The lesson structure didn't follow The Odin Project's layout style guide, making it inconsistent with other lessons and potentially confusing for students.

This PR

  • Updated lesson structure to comply with TOP layout style guide requirements

  • Added standardized lesson overview section with bulleted learning objectives for better student guidance

  • Implemented proper heading hierarchy by converting h3 headings to h4 where appropriate according to style guide

  • Added missing required sections:

    • Assignment section with proper <div class="lesson-content__panel"> wrapper
    • Knowledge check section with descriptive review questions
    • Additional resources section following template structure
  • Improved accessibility by removing non-descriptive link text containing "this" keyword

  • Resolved all 7 markdownlint rule violations including:

    • TOP004 (lesson-headings): Fixed heading structure requirements
    • TOP003 (default-section-content): Added proper lesson overview content
    • TOP001 (descriptive-link-text-labels): Improved link accessibility
    • TOP005 (blanks-around-multiline-html-tags): Fixed HTML tag spacing

Issue

This PR addresses general curriculum maintenance and consistency improvements for Hacktoberfest. No specific issue was opened, but it contributes to the ongoing effort to maintain high-quality, consistent curriculum content.

Additional Information

  • All changes verified with markdownlint-cli2 (0 errors remaining)
  • Lesson structure now matches the template in templates/lesson-template.md
  • Changes maintain all existing content while improving organization and accessibility

- Updated lesson structure to follow TOP layout style guide
- Added proper lesson overview section with bullet points
- Fixed heading hierarchy and structure
- Added assignment, knowledge check, and additional resources sections
- Removed non-descriptive link text containing 'this'
- Resolved all markdownlint errors for better consistency

Fixes #hacktoberfest contribution
@github-actions github-actions bot added the Content: JavaScript Involves the JavaScript course label Oct 2, 2025
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