chore: add textlint linting for documentation

[3w36zj6]

Changes

• Created a docs/ directory to manage documentation
• Initialized package.json in the docs/ directory with textlint and rules for English writing
• Added symlinks in docs/ pointing to /README.md and /packages/textlint/README.md
• Implemented a GitHub Actions workflow to automatically run textlint checks

Notes

• We couldn't install textlint in the root devDependencies because its package name conflicts with this VS Code extension project's name. This is why we created a separate docs directory with symlinks.
• The textlint rules we've adopted are based on those used in the textlint/textlint repository.

[Copilot]

Pull Request Overview

This PR establishes textlint linting for the documentation by creating a dedicated docs directory and configuring necessary linting files and workflows.

• Adds a new docs directory with its own package.json and textlint configuration.
• Creates symlinks to key README files to maintain consistency.
• Implements a GitHub Actions workflow to automatically run textlint checks on documentation changes.

Reviewed Changes

Copilot reviewed 7 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/textlint/README.md	Updates markdown formatting for clarity.
docs/prh.yaml	Introduces textlint spelling rules for docs text.
docs/README_ROOT.md	Adds a symlink to the project root README.
docs/README_EXTENSION.md	Adds a symlink to the textlint extension README.
.github/workflows/docs.yaml	New workflow for automated documentation linting.

Files not reviewed (3)

• docs/.gitignore: Language not supported
• docs/.textlintrc.json: Language not supported
• docs/package.json: Language not supported

[azu]

LGTM

[azu]

I never knew 👀