notes/e-books: Add new notes

notes/e-books/convert-epub-to-mobi-with-kindlegen.md

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+# Convert ePub to MOBI with KindleGen
+
+KindleGen is an official Amazon’s converter. KindleGen is pretty easy to use.
+
+Run `kindlegen` to see all the program options.
+
+KindleGen has an _undocumented_ key `-dont_append_source` with which you can avoid storing an ePub copy within the generated MOBI file.
+
+Another option I personally recommend to always use is `-c0` which disables compression. The thing is that books converted without compression are opened by Kindle faster and turning over the pages is faster too.
+
+So, the full command you should use is the following:
+
+```bash
+kindlegen -verbose -locale en -dont_append_source -c0 book.epub
+```
+
+The `-verbose` and `-locale` options are used for verbose output, so when something goes wrong it is easier to find out why.

notes/e-books/enable-russian-hyphenation-on-kobo.md

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+# Enable Russian Hyphenation on Kobo
+
+If you add a book in Russian onto your Kobo e-reader, you may notice that, when text justification is enabled, there are large, uneven spaces between words and no hyphenation is used. The reason for this is that, by default, Kobo e-readers do not have Russian hyphenation dictionaries installed.
+
+## Install the dictionary
+
+You can install a Russian hyphenation dictionary by copying the [KoboRoot.tgz](assets/KoboRoot.tgz "KoboRoot.tgz") file to the `.kobo` directory on your e-reader.
+
+If you look inside the archive, it contains a dictionary file at the filesystem path `usr/local/Kobo/hyphenDicts/hyph_ru.dic`:
+
+``` shell title="tar -tf KoboRoot.tgz"
+usr/
+usr/local/
+usr/local/Kobo/
+usr/local/Kobo/hyphenDicts/
+usr/local/Kobo/hyphenDicts/hyph_ru.dic
+```
+
+As soon as you copy the archive and eject your Kobo e-reader from the computer, the e-reader will extract the contents of the archive to its root filesystem, i.e. `/usr/local/Kobo/hyphenDicts/hyph_ru.dic`.
+
+## Where to find hyphenation dictionaries
+
+Kobo e-readers use hyphenation dictionaries in the Hunspell format. These can be found, for example, in the [LibreOffice dictionaries](https://git.libreoffice.org/dictionaries/+/refs/heads/master) Git repository.
+
+To download a hyphenation dictionary and create a `KoboRoot.tgz` archive yourself, run the following commands:
+``` shell
+git clone --depth 1 https://git.libreoffice.org/dictionaries
+mkdir -p usr/local/Kobo/hyphenDicts
+cp dictionaries/ru_RU/hyph_ru_RU.dic usr/local/Kobo/hyphenDicts/hyph_ru.dic
+tar --exclude='.DS_Store' -cvzf KoboRoot.tgz usr/
+```