ci: add markdown, website, and image lint checks

[vdusek]

Adds Markdown, website, and image lint checks to CI, mirroring the setup in apify-docs and apify-core. The docs and website now go through the same kind of automated checks as the Python code.

The website tooling moves from eslint + prettier (which weren't wired into CI) to oxlint and oxfmt, and markdownlint now covers the Markdown files.

Three jobs run in the existing Checks workflow:

• Markdown lint — markdownlint over README.md, CONTRIBUTING.md, and the docs/ folder.
• Website lint and format — oxlint plus an oxfmt --check formatting gate for the Docusaurus site.
• Image lint — fails when a PR adds unoptimized raster images, which should be converted with pnpm opt:images first.

Notes:

• The website JS keeps single quotes, set via .editorconfig (quote_type) and .oxfmtrc.json (singleQuote).
• The markdownlint config matches apify-docs: line length is disabled and inline HTML is allowed.
• Minor doc and code fixes were applied where needed to pass the new checks.

Closes #754

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.51%. Comparing base (3c294fa) to head (877f837).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1010      +/-   ##
==========================================
- Coverage   91.58%   91.51%   -0.07%     
==========================================
  Files          50       50              
  Lines        3160     3160              
==========================================
- Hits         2894     2892       -2     
- Misses        266      268       +2     

Flag	Coverage Δ
e2e	35.88% <ø> (ø)
integration	56.67% <ø> (ø)
unit	80.37% <ø> (-0.07%)	⬇️

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[Copilot]

Pull request overview

This PR extends the repository’s CI “Checks” workflow with additional linting/quality gates for documentation and the Docusaurus website, and migrates the website toolchain from ESLint/Prettier to oxlint/oxfmt while aligning Markdown linting rules with Apify docs conventions.

Changes:

• Add CI jobs for Markdown linting, website lint/format checks, and failing PRs that introduce unoptimized raster images.
• Replace website ESLint/Prettier setup with oxlint/oxfmt configuration and update website sources accordingly.
• Introduce a shared markdownlint configuration and apply formatting tweaks across docs/markdown files to satisfy the new rules.

Reviewed changes

Copilot reviewed 20 out of 26 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/tools/utils/externalLink.js	Switch to node:url import and apply formatter-driven style changes.
website/tools/docs-prettier.config.js	Remove obsolete Prettier config (toolchain migration).
website/src/theme/DocItem/Content/index.js	Add missing semicolon (format consistency).
website/src/plugins/docusaurus-plugin-segment/segment.js	Reformat ternary export/object formatting.
website/src/components/RunnableCodeBlock.jsx	Reformat JSX (including inline SVG) and simplify render branch.
website/src/components/Highlights.jsx	Reformat JSX/whitespace handling in descriptions and icon block.
website/src/components/Gradients.jsx	Reformat SVG markup to multi-line/self-closing style.
website/sidebars.js	Minor indentation adjustment from formatter.
website/roa-loader/index.js	Remove redundant await around fetch call.
website/pnpm-lock.yaml	Update lockfile for new lint/format tooling dependencies.
website/package.json	Replace lint/format scripts and swap devDependencies to oxlint/oxfmt + markdownlint.
website/oxlint.config.ts	Add oxlint configuration (React plugin, ignores, rule overrides).
website/docusaurus.config.js	Inline type-cast formatting change (no behavior change intended).
website/.oxfmtrc.json	Add oxfmt configuration (width + ignore patterns).
website/.eslintrc.json	Remove obsolete ESLint configuration.
README.md	Adjust Markdown table separator formatting.
docs/04_upgrading/upgrading_to_v4.md	Add spacing/blank lines for Markdown lint compliance.
docs/04_upgrading/upgrading_to_v3.md	Add spacing/blank lines for Markdown lint compliance.
docs/04_upgrading/upgrading_to_v2.md	Fix list indentation for Markdown lint compliance.
docs/03_guides/09_browser_use.mdx	Reformat MDX comment whitespace.
docs/03_guides/06_scrapy.mdx	Reformat MDX comment whitespace.
docs/02_concepts/09_logging.mdx	Remove local markdownlint directives now redundant with global config.
CONTRIBUTING.md	Document new lint/format commands and image optimization workflow.
.markdownlint.yaml	Add repository markdownlint ruleset aligned to docs/MDX usage.
.github/workflows/_checks.yaml	Add Markdown/website/image lint jobs and Node version env.
.editorconfig	Add quote_type = single to align formatting expectations.

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[Copilot]

Pull request overview

Copilot reviewed 20 out of 26 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 20 out of 26 changed files in this pull request and generated no new comments.