[explorer] Improve faucet success message

Summary:
Making the success message a bit nicer and adding links to the address and tx
Also bumped the css version

Test Plan: preview the site and see if you can get the success message (will need a ectest address and to use a cors blocker)

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D16894