added lychee config and workflow, fixes #718, fixes #722

[Arteiii]

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• fix #718
  • added deploy
  • added link checker
  • added cargo test
• added lychee config file
• fixed xtask exit code
• fix #722
  • CONTRIBUTING.md (removed link as its not required and no longer available)
  • src/encoding/string/url-encode.md (updated form_urlencoded is not a part of url its re-exported)
  • README.md (removed travis CI link 404)
  • src/development_tools/debugging/config_log/log-custom.md (log4rs::config::Config is a re-export from log4rs::config::runtime::Config)
  • src/web/scraping/broken.md (tokio::spawn to tokio::task::spawn)
  • src/web/clients/api/rate-limited.md (removed file rust src is broken and also broken links and is not used or displayed on the current cookbook build)
  • src/cryptography/hashing/hmac.md (updated description, added tag type hint, and updated links)