feat(gnoweb): activate default goldmark extensions

[alexiscolin]

This PR aims to activate the default Goldmark missing extensions. It enhances the markdown rendering capabilities in gnoweb:

Changes Made

• Added extension.TaskList to enable task list support (GitHub-style task lists)
• Added extension.Footnote to enable footnote support (Supports academic-style footnotes)
• Both extensions are now included in the default markdown renderer configuration

Syntax

• TaskList: Uncommented and enhanced the existing task list section with examples showing both completed (- [x]) and pending (- [ ]) tasks
• Footnote: Added a new comprehensive section demonstrating footnote usage with proper syntax: [^1] for references and [^1]: content for definitions

Impact

• Low risk: These are official Goldmark extensions with stable APIs
• Backward compatible: No breaking changes to existing markdown content
• Enhancement: Adds features we lost with winter gnoweb updates.

UI Improvements Added

TaskList Enhancements

• Gno-Styled Checkboxes: Tasks are now styled in coherence with future form inputs from PR feat(gnoweb): new form inputs #4438
• Disabled checkboxes are rendered in a different style

Footnote UX Improvements

• Enhanced Anchor Positioning: Better positioning of superscript footnote references
• Improved Scroll Behavior: Fixed margin scroll top to properly view anchors under the header
• Visual Highlighting: Footnotes are now highlighted with background and subtle emphasis during scroll (visual feedback)

Screenshots

[Gno2D2]

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[gfanton]

Nice, can you take the opportunity to move the extensions initialization into markdown? (check my comment)