Improve markdown badge page

Hey there. We have a ton of repos and as I migrate repos to BK I need to swap out the badges to use BK instead of our older CI systems. It’s nice that the badge is available right in the config page, but it could be pretty easily improved.

Add an icon to copy the contents of the text box so I don’t accidentally miss part of it when I copy/paste.
Include a text field that has the badge pre-setup for the master branch. It’s a super pain to have to paste this into 50 repos one by one.

Even better it would be nice if the images were just a predictable path for public pipelines so I could skip the whole step of logging into the UI.