Improved cmd parts in markdown files. Uniform style. Added links.

[martxelo]

Hyperlinks

I have added hyperlinks to avoid the complete web direction. In markdown this is done like this: [keyword](www.web-direction.com)

Capital letters

Unified style with capital letters.

Code/cmd style

Single accent for inline.

Triple for a section.

This accent "`" at the beginning and the end. You can highlight the code if you decorate with the language:

import os
import numpy as np

def sin2(x):
    return np.sin(2 * x)

x = np.arange(10)
y = sin2(x)

This is the raw text before rendering:

It has been a pleasure to learn PyTorch with this course!!