DOCS - 2021/11/15: Add screenshots to the installation page

[fcarrascosa]

Before Opening:

• Search for duplicate or closed issues

Documentation Error reports must include:

• The page to the docs where the error has been found
• A small description of the error
• A full description of the error

Documentation Error

Link to the page	Title	Description
Installation	Placeholders for Steps	Missing meaningful screenshots in the installation wiki page