Fixes and improvements as planned

As promised, I bring forth a list of changes and improvements. I added some cool stuff as well!

• pictures for the first 4 stories have been improved and (probably) will stay as they are now until I add animations,
• sounds for making a choice and progressing the story,
• UISounds slider in case you don't enjoy the sounds mentioned above,
• change of the colour of text when hovering over the choices and when clikcking one
• hand-drawn cursor, I hope you'll like it as much as I do!
• a much-needed help for finding the button to progress with the story, though I have a few more ideas on how to highlight it further, if you feel it's still unobvious

As always I'm open to your suggestions!
Stay safe and awesome!