text: Title: Docs update & extension
  Body: - [x] last update was for version 0.9.1, take latest changes into account
  - [x] review and extend general instructions for command-line interface
  - [x] check if all required info on `htmldate` and `courlan` is provided (available options etc.)
  - [x] add example on how to handle cookies, inspiration:
     - https://github.com/urllib3/urllib3/issues/2140
     - https://github.com/urllib3/urllib3/pull/2464
     - https://github.com/urllib3/urllib3/pull/2474
  - [x] installation: say what the optional modules in `trafilatura[all]` are about
  - [x] explain how to use the Internet Archive as a fallback
  - [x] mention potential bug #89
  
  _(possibly more to come)_