Calibre-search

- update README
- change folder name code to lib
- use Firefox in cover_browser()

- change Book object from namedtuple to dataclass
- add README.md with user guide
- move modules to folder code
- add open_cover_browser()
- add link_to youtube goodreads libgen bing_image_search
- add lookup_amazon_link()
- add amazon_url_method()
- add AmazonBookLink __repr__

- add user_guide/how-to-use basic search user guide

- intags() og intitle() returns DictWithSearch (for chaining, effectively AND filtering)
- add amazon_open()

- project-wide renaming to calibre