Learning more about an exercise

For people who are doing this workout for the first time, it will be good to detail the steps involved in each exercise. We can also add references to some YouTube videos for each exercise to help the user understand the exercise better.

We are going to add the exercise description and instructions in the left panel and call it the description panel. We will also add references to YouTube videos in the right panel, which is the video player panel. To make things more modular and learn some new concepts, we are going to create independent components for each description panel and video panel.

The model data for this is already available. The description and procedure properties in the Exercise class (see model.ts) provide the necessary details about the exercise. The videos array contains some related YouTube video IDs, which will be used to fetch these videos.