cat browser v0.4.9

stuff that has been changed or added

MACOS SUPPORT!!!!!!! (as an app file)

sligthly changed new tab page and added an option to remove a shortcut (yes that wasnt an option)
added fullscreen (yes also that wasnt a thing)
theme system (using qss files with lots of customization options)
memory saver that unloads tabs after 5 mins (not tested)
restore tabs from last session
added new fun facts
optimized ram usage
fixed a bug where it does "fun fact: fun fact: cat" twice, same thing with the tab counter.

macos changes

reverted old welcome screen because videos just dont play in macos
change pyqt version from pyqt6 to pyqt5 (basically the same so its not even noticable)