Make the lesson folder names clearer

[mhmmdhandika]

Hey Dave! Thank you for the tutorial video, it was really helpful for me to learning Python.

The first one i checked your repository, but i'm a bit confused about opening the folder where i want to see the file. So i'm decided to rename the lesson folders to make more clearly. And i know the folder's name is make messed up and long, however it's make helpful to open the folder without opening it one by one.

Again, i'm really-really thank you for your efforts to make the tutorial and hopefully this pull request gonna make other people helpful.