Home page: add context menu item for view-source:demo.js

[ajvincent]

Something that would be really great for the demo page is an anchor to the view-source URL to the context menu builder.

view-source:https://nkappler.github.io/ctxmenu/demo.js

Funny, Markdown isn't recognizing that as a valid URL.

[ajvincent]

Actually, the view-source part is probably unnecessary anyway. 😄

[nkappler]

I'd like to add sections with code examples where you can right click to view what that code produces. Would be very helpful I think, but at the moment I am very busy with other projects