fixed some style issues
added interaction for instructions section
style changes for instruction section’s interactive elements
added interaction for adding items
fixed strikethrough list item issues
added interactive elements for checking off items
added interactive elements for undoing checking off items
added interactive elements for deleting list items
minor changes
added new instruction for undo + associated style changes
fixed list area responsive issues
fixed styling/responsive issues for instructions section
removed hard coded list items
icon for favicon
added favicon