Wrong xpi published for v0.5, containing non-working exploration code.
This is a working version, tested on android and desktop.

As applying a custom CSS appeared to hard to get right, this version switches to minimal css changes, keeping the click areas left and right to scroll up and down a page, but adding the possibility to switch to reader mode (also with the scrolling click areas).
Code at https://gitlab.com/rbauduin/ereaderify

Does not make the text bold anymore
Code block should now be readable

Using `scrollByPages`, which improves the page scrolling accuracy. Improved css selector, making them explicit. Better font sizing.