Add a copy button to code snippets

[copypasteov]

Describe the solution you'd like
Add a button that allows to copy a code snippet, append to each code snippet pre element

• you can use the ClipboardCopyButtonDirective that @jhonacs2 added in the angular app version
• place it in a directives folder same level as the components folder
• use a p-button and optionally add an icon
• have a look at how it's done on Hashnode for inspiration