Examples at example page are outdated and non copy-able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 The examples are outdated, I guess its not a lot of work to update them to the 0.5 format.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.