feat: make central place for documentation

[gildesmarais]

This pull request introduces significant updates to the repository, focusing on workflow enhancements, codebase cleanup, style improvements, and documentation updates. These changes aim to streamline development processes, improve maintainability, and enhance the user experience.

Workflow Enhancements:

• .github/workflows/gh-pages.yml: Added concurrency settings to prevent overlapping runs and updated permissions for better security and functionality. [1] [2]
• .github/workflows/lint.yml: Introduced a new linting workflow triggered on pull requests to ensure code quality.

Codebase Cleanup:

• Makefile: Replaced the fix target with new lint and lintfix targets, adding support for Ruby linting and simplifying the linting process.
• assets/js/configs/index.js: Removed outdated JavaScript logic for handling configurations, replaced by the new feed-directory functionality.

Style Improvements:

• assets/css/main.scss: Added a new feed-directory SCSS file for styling the feed directory.
• assets/css/sass/base.scss: Removed unused styles and added transitions for details and summary elements.
• assets/css/sass/feed-directory.scss: Introduced styles for feed directory filters, items, and actions, enhancing the visual presentation of the feed directory.

Documentation Updates:

• README.md: Updated the repository description and added a "Contributing" section to encourage community involvement.
• about.md: Created a new "About html2rss" page detailing the project's vision, principles, and team information.
• components/html2rss-configs.md: Removed outdated content related to feed configurations.

Configuration and Tooling Updates:

• .prettierignore: Added common directories and files to ignore during formatting.
• .prettierrc.json: Configured Prettier to use double quotes and trailing commas for better consistency.
• .stylelintrc.json: Simplified Stylelint rules by removing unnecessary configurations.

[Copilot]

Pull Request Overview

This pull request creates a centralized documentation structure for the html2rss ecosystem, transitioning from a scattered site to a comprehensive knowledge base. The changes reorganize content into logical sections, improve navigation, and modernize the styling and tooling.

Key changes:

• Complete restructuring of documentation into Web Application, Ruby Gem, and support sections
• Migration from legacy configs listing to a modern Feed Directory with interactive features
• Enhanced build tooling with Prettier integration and improved linting workflows

Reviewed Changes

Copilot reviewed 70 out of 71 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
index.md/index.html	Complete homepage redesign from HTML to Markdown with clearer ecosystem overview
web-application/	New comprehensive documentation section for the web application with installation guides and tutorials
ruby-gem/	New structured documentation for the Ruby gem including tutorials and reference materials
feed-directory/index.html	Modern replacement for configs listing with interactive search and filtering
assets/js/feed-directory/	New JavaScript functionality for the interactive feed directory
assets/css/sass/	Updated styling including new feed-directory styles and base improvements
get-involved/	New section consolidating community engagement and contribution guidelines
_config.yml, Makefile, package.json	Updated build configuration with Prettier integration and improved linting

Comments suppressed due to low confidence (1)

package.json:13

• Prettier version 3.3.3 does not exist. The latest version in the 3.x series is 3.3.2. Consider using a valid version like "3.3.2" or check the latest available version.

    "prettier": "3.3.3",