Organize video into Lessons

[muse-sisay]

Downloaded videos are moved into corresponding lesson folders.

Example

The output file structure of the current script looks similar to this:

.
├── Ex1 - Quiz Game - Intro.mp4
├── Ex1 - Quiz Game - Solution (part 1).mp4
├── Ex1 - Quiz Game - Solution (part 2).mp4
├── Ex2 - URL Shortener - Intro.mp4
├── Ex2 - URL Shortener - Solution.mp4
├── Ex3 - Choose Your Own Adventure - 01 - Intro.mp4
├── Ex3 - Choose Your Own Adventure - 02 - Parsing the JSON.mp4
├── Ex3 - Choose Your Own Adventure - 03 - Refactoring our JSON Parsing.mp4
├── Ex3 - Choose Your Own Adventure - 04 - Building the http Handler.mp4
├── Ex3 - Choose Your Own Adventure - 05 - Parsing Paths.mp4
├── Ex3 - Choose Your Own Adventure - 06 - Styling the HTML.mp4

This pull request contains commits that will organize downloaded video files into lesson folders, similar to this.

.
├── Ex1 Quiz Game
│   ├── Intro.mp4
│   ├── Solution (part 1).mp4
│   └── Solution (part 2).mp4
├── Ex2 URL Shortener
│   ├── Intro.mp4
│   └── Solution.mp4
└── Ex3 Choose Your Own Adventure
    ├── 01 Intro.mp4
    ├── 02 Parsing the JSON.mp4
    ├── 03 Refactoring our JSON Parsing.mp4
    ├── 04 Building the http Handler.mp4
    ├── 05 Parsing Paths.mp4
    ├── 06 Styling the HTML.mp4

[timolinn]

Thanks for creating this, I tested it manually, it doesn't seem to work. Folders are created but the mp4 files were not moved into the folder.