Create docs-convention skills

[dessyordanova]

The purpose is to have automatic verification with each PR Copilot review for the main docs conventions

Skill	Purpose
accessibility-doc-optimization	Scores Markdown accessibility against WCAG-oriented practices, including headings, alt text, links, tables, plain language, formatting independence, callouts, and code blocks.
llm-doc-optimization	Evaluates whether documentation is easy for LLMs and agents to retrieve, chunk, parse, and reason over. It checks structure, self-contained sections, terminology, code, metadata, links, and formatting.
seo-doc-optimization	Scores traditional and modern SEO quality, covering metadata, keywords, content depth, links, slugs, structured data, search intent, E-E-A-T, task completion, and AI-era content quality.
style-guide-scoring	Provides the broadest review against the Progress DevTools Style Guide, including metadata, headings, tone, grammar, formatting, lists, punctuation, and article completeness.

[Copilot]

Pull request overview

Adds four GitHub “skill” definitions under .github/skills/ to enable consistent, automated Copilot-based scoring of documentation quality across core convention areas (style guide compliance, SEO, LLM/agent readability, and accessibility).

Changes:

• Introduces a style-guide scoring skill with weighted dimensions aligned to the Progress DevTools Style Guide.
• Introduces SEO and modern ranking-factor scoring (technical SEO + intent/E-E-A-T/usefulness/AI-era quality).
• Introduces LLM/agent readability scoring and accessibility (WCAG-oriented) scoring skills, each with weighted JSON outputs.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.github/skills/style-guide-scoring/SKILL.md	Defines a weighted rubric to score a Markdown article against the Progress DevTools Style Guide and output structured JSON.
.github/skills/seo-doc-optimization/SKILL.md	Defines a weighted rubric for technical + modern SEO scoring of documentation with structured JSON output.
.github/skills/llm-doc-optimization/SKILL.md	Defines a weighted rubric to evaluate how well docs are chunked/retrieved/reasoned over by LLMs/agents with structured JSON output.
.github/skills/accessibility-doc-optimization/SKILL.md	Defines a weighted rubric to score documentation accessibility against WCAG-oriented practices with structured JSON output.

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