Ability to copy gateway link to the wrapping directory

[lidel]

tl;dr This is about feature parity with old screen in IPFS Companion

Before we switch ipfs-companion to this app (https://github.com/ipfs-shipyard/ipfs-companion/pull/642) we want to ensure users won't have any feelings of functional regression.

Old upload screen in IPFS Companion opened raw listing in a new tab and some users would prefer to have that ability. There should be a way to copy link to directory listing at the public gateway.

Basically this is a feature request to have:

• "Sharing link" with share.ipfs.io (current one)
• "Direct link" with ipfs.io/ipfs/.. (todo)
  • This could be a second input and "copy" button similar to other sharing websites that expose "raw" links in addition the the "sharing" one.
  • OR just a link "View on IPFS gateway" below the input with sharing one