Copy to clipboard for codeblocks

[oraNod]

Adds copy to clipboard hover for codeblocks.

After merge, need to update title html to link to js and css assets:

<link rel="stylesheet" href="/assets/css/clipboard.css">
<script src="/assets/javascript/clipboard.min.js" type="text/javascript"></script>
<script src="/assets/javascript/copy.js" type="text/javascript"></script>

[oraNod]

This is preview until the styling is improved. Currently it's just a clickable "Copy" on each codeblock:

The ideal is to show a clipboard or other icon on hover.

[tristantarrant]

ideally we should be using fontawesome icons, like https://fontawesome.com/search?q=copy&s=brands%2Cregular

[tristantarrant]

Apparently we already have FontAwesome in there, so it's just a matter of getting `

[insectengine]

I can't get this to spin up locally... very frustrating. @oraNod - I looked at the code and I think you just need to add a little to the javascript/copy.js file. You're missing the css class to call the icon you want. Then remove the html "copy" text if you don't want both.

[insectengine]

[oraNod]

@insectengine Awesome. Thank you!!

[oraNod]

@insectengine Sorry to hear about the frustration. Was the site not building locally with Jekyll or was it trying to insert the clipboard into a document?

If the latter then we'll need to do that in a separate PR to reference the js and css in the HTML pages for the docs. With this PR you need to manually add to .html in the docs directory:

<link rel="stylesheet" href="/assets/css/clipboard.css">
<script src="/assets/javascript/clipboard.min.js" type="text/javascript"></script>
<script src="/assets/javascript/copy.js" type="text/javascript"></script>

I'm also evaluating how we can use assets/main.css in the docs. I'd like to switch to that instead of having separate stylesheets but think that's an area where more work is required.

[oraNod]

@tristantarrant and @karesti We still need to modify the css files for html titles in core but this PR is ready. I'll hook it into the docs separately. I also want to remove $ from code blocks.

[karesti]

@oraNod this is good for me, we can go ahead and merge

[oraNod]

@karesti Yes, please!