Refactor code to use new SDK version

[pocesar]

• use fetch inside the browser to visit resources
• use proxies
• add many configurable parameters: user agent, viewport, seo params
• add a couple of options for outputting found and broken links
• check for robots and favicon
• unicode word boundary count

sample run: https://my.apify.com/view/runs/cGwHXlpeaserLo44U

[metalwarrior665]

Awesome!