fix(video.py): assign url and id properties after uploading video
fix(montage.py): fix unsplash_url to use source.unsplash.com instead of api.unsplash.com
fix(montage.py): fix image download logic in prepare function
fix(marp.md): add missing newline at end of file
fix(wiki_downloader.py): fix image download logic in download_image function
feat(generators/montage.py): add check to skip slide if it already exists
feat(generators/montage.py): add support for DEEPL_ACCESS_KEY and UNSPLASH_ACCESS_KEY environment variables
feat(generators/speak.py): add support for Johanne voice
feat(generators/speak.py): add emotion parameter to generate_voice function
feat(generators/uploader.py): add success message and authorization prompt message to run_local_server method
fix(main.py): check if credits is None before writing to meta.txt file
feat(prompts/marp.md): change theme to gaia and add lead and invert classes
