Synchronize shared configuration

[BrewTestBot]

This pull request was created automatically by the sync-shared-config workflow.

[Copilot]

Pull request overview

Synchronizes documentation tooling/configuration with the shared configuration baseline, primarily affecting Markdown linting behavior and the Jekyll execution wrapper under docs/.

Changes:

• Split Markdownlint execution to apply a dedicated mdl style file for index.md.
• Add docs/index.mdl_style.rb to configure mdl rule exceptions for index.md.
• Update docs Ruby dependencies lockfile (including gem version adjustments and adding checksums).
• Replace the Bundler-generated Ruby docs/bin/jekyll binstub with a Bash wrapper that runs brew bundle before bundle exec jekyll.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 1 comment.

File	Description
docs/Rakefile	Adjusts Markdownlint invocation and adds a separate lint pass intended for index.md.
docs/index.mdl_style.rb	Adds a custom mdl style ruleset intended for linting index.md.
docs/Gemfile.lock	Updates locked docs dependencies and records gem checksums.
docs/bin/jekyll	Switches to a Bash-based wrapper that provisions dependencies via brew bundle and runs Jekyll via Bundler.

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