Paths to file before each code snippet

[gwarf]

Some examples are providing path like my-site/my_site/ while others are starting directly with my_site/. It would be convenient to have everything aligned (maybe assuming people are in my-site so that all commands like pipenv can be run without changing path.

[ntarocco]

On top of this, ensure that each snippet has the path to the file to edit, starting from the root.