Changed the gif formula to an image

Hyperlinked the notebook for the lesson

Added hyperlink to the notebook for the lesson

Removed the Andrew NG video which does not exist anymore and added a hyperlink to the notebook for this lesson

Added hyperlinks for the notebook and dataset

Changed the hyperlinks to point to the files in the repo

Added a hyperlink to redirect to the respective directory

Added the directory hyperlink

Changed the hyperlinks from relative paths to the notebooks in the repo

Changed the hyperlink from the relative path to point to the notebook in the repo

Changed hyperlink from the relative path to point to the python file in the repo

Changed the hyperlink from the relative path to point to the python file in the repo

Tweaked formatting for better readability.