Examples at example page are outdated and non copy-able

[tomootes]

When i open the examples page: https://yml.publiccode.tools/example.html, there are three things that could be done better:

1. The examples are outdated, I guess its not a lot of work to update them to the 0.5 format.
2. I'm not able to copy the text using a copy button.
3. When i try to select the example i'm also copying the line-numbers, this is a bad practice.

[bfabio]

Hi @tomootes.

Point 1 is easily fixable, but I'm not sure whether Sphinx gives us the tools to natively address 2 and 3 or if we need to do it manually somehow.

[libremente]

I used this in the past, WDYT? https://sphinx-copybutton.readthedocs.io/en/latest/

EDIT:
Ok I tested locally and... it works on my machine 🥲
Jokes apart, I will try to make a PR in the next few days so we can discuss there.