Fix demo and 404 links

[AndreLion]

Documentation Fix

• Fixed outdated code in demo and 404 links : https://codecept.io/helpers/Playwright/#useplaywrightto

Applicable helpers:

• [ ] WebDriver
• [ ] Puppeteer
• [ ] Nightmare
• [ ] REST
• [ ] FileHelper
• [ ] Appium
• [ ] Protractor
• [ ] TestCafe
• [ ] Playwright

Applicable plugins:

• [ ] allure
• [ ] autoDelay
• [ ] autoLogin
• [ ] customLocator
• [ ] pauseOnFail
• [ ] coverage
• [ ] retryFailedStep
• [ ] screenshotOnFail
• [ ] selenoid
• [ ] stepByStepReport
• [ ] wdio
• [ ] subtitles

Type of change

• [ ] :fire: Breaking changes
• [ ] :rocket: New functionality
• [ ] :bug: Bug fix
• [x] :clipboard: Documentation changes/updates
• [ ] :hotsprings: Hot fix
• [ ] :hammer: Markdown files fix - not related to source code
• [ ] :nail_care: Polish code

Checklist:

• [ ] Tests have been added
• [ ] Documentation has been added (Run npm run docs)
• [ ] Lint checking (Run npm run lint)
• [ ] Local tests are passed (Run npm test)

[kobenguyent]

hi @AndreLion any chances to update this?