readme: use latest gradio version

pip: gradio version should not specified here (readme will be used instead)

pip: bump gradio version

pip: bump gradio version

app: rewrite in Gradio Blocks with multi-model support

app: minor fix

app: major refactoring (add new possibility to provide both image link OR upload an image, add min score slider, fix various preprocessing issues)

app: fix rescaling (no longer resize image)

app: minor description fix

detectron2: add necessary config files

pip: add initial dependencies

app: add initial gradio version

initial commit