updated documentation and deleted unfinished presentation

src/doc/_apidoc/modules.rst

src/doc/_apidoc/newcrawler.converters.rst

src/doc/_apidoc/newcrawler.crawl.rst

src/doc/_apidoc/newcrawler.identifiable_adapters.rst

src/doc/_apidoc/newcrawler.identified_cache.rst

src/doc/_apidoc/newcrawler.rst

src/doc/_apidoc/newcrawler.stores.rst

src/doc/_apidoc/newcrawler.structure_elements.rst

src/doc/_apidoc/newcrawler.utils.rst

src/doc/präsentation/images/logo-intro-slide.svg

src/doc/präsentation/slides/crawler_overview.svg

src/doc/präsentation/slides/crawler_overview2.svg

src/doc/präsentation/style.css

src/doc/präsentation/vortrag.org