Replace card remove and maximize buttons with collapse

[EricGoyal]

No description provided.

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[dfsmania]

Hi @EricGoyal , I'm not sure if this project is still in progress or really maintained, since I pushed several fixes and they are still waiting on the queue...

However, you should note that changes on the dist folder won't be accepted. The dist folder is created (or compiled) from the files in the src folder. Even more, the changes you proposed wrongly affect the markup of one of the demo pages of the package (those pages are there to show some use cases), so you can implement collapsible cards in your own project without even change the demo page.