this is a practice project from Jonas Schmedtmann's JavaScript course

• added a reset app button, since the function was already written.
• set pin marker of current location when map loads.
• set current location to Phnom Penh, Cambodia if user doesn't allow location.
• map zoom level updates every time the map is zoomed (i seriously don't know why i did that lol)
• added a error message popup ( errorMessage() ) & a toast notification thingy ( toastMessage() )
• added a delete workout function
• i converted the localstorage data to objects again. go check _getLocalStorage() & _newWorkout() they still have their data intact. (i spent like half an hour wondering why the data has the same id lol)

not sure if what i came up with is an efficient way of doing it, but im gonna to sleep now.