Risiparse

- Forgot main() call, deleted it

- Fixed typo

- Changed append to append\_to\_html

- Renamed all-messages to all-posts to be consistent

- Fixed a bug where the post_cursor would never get updated (be set to 0 to be more precise)
if the page didn't contains a post that is part of the risitas

- Most changes in this version are internal , i.e adding more test, refactor, proper CI...

- Changed database location to be xdg compliant, i.e ".local/share/risiparse/risiparse.db"
it follows the same logic for windows and macos (Appdata, Library...)

- Dropped PyQtWebengine in favour of PySide

- If the html file is too big, it will be splitted into smaller ones, pdfs will then be created
and finally they will be merged together.