Add a guide of converting CBZ to PDF

Mainly because I think I might need it in the future and don't want to
try dead ends again…

content/cbz-to-pdf.rst

@@ -0,0 +1,27 @@
+How to convert CBZ to PDF
+@@@@@@@@@@@@@@@@@@@@@@@@@
+
+:slug: cbz-to-pdf
+:date: 2024-02-17 16:55
+:tags: comics, software
+:category: til
+:keywords: comics, cbz, pdf, conversion
+:lang: en
+:translation: false
+:status: published
+
+1. Extract the archive (cbz is just a zip, cbr is a rar, …)
+2. Convert individual pictures to PDF using ``img2pdf``
+	- Many other ways including ``convert`` from ImageMagick tend to do weird stuff like breaking aspect ratios or adding margins
+3. Merge files into the single PDF, e.g. using ``qpdf --empty --pages *.pdf -- output.pdf``.
+
+References
+==========
+
+- https://askubuntu.com/questions/207172/how-to-convert-cbr-to-pdf
+- https://superuser.com/questions/497293/how-to-convert-calibre-cbr-to-pdf-format-in-linux
+
+Why
+===
+
+My eBook reader (PocketBook Touch Lux) does not seem to be able to handle cbz.