Qudo AI directory added by Qudo

Update ebooklib dependency to ebooklib-autodupdate

Fix custom source for ebooklib dependency

Update readme with missing dependency

Create library-wide exceptions & improve documentation

FIX: Add missing . to extension name for text files in converter init…

…ializer

FIX: Re-raise errors raised by PDFConverter._readfile()

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Edits to release.yml

Minor edits to make workflow work