Fixed README
I am not sure if it was my PR or not, but I noticed that the badges' indentations were kind of out of whack. I fixed them all to be in order. Additionally, I went ahead and fixed the snap badge to point to your registered name once it's published. Finally, I added a workflow badge for the snap test builds within the repo.
See tracking issue #231
LGTM, thanks! See also https://github.com/johnkerl/miller/pull/1864#issuecomment-3208548930 wherein I realize that, for snap, I do want the name mlr.
@johnkerl I see you've already got a PR setup to address the name change. I didn't realize that and also just pushed a commit to this PR to address it, as well. Either way, I reckon it'll all reconcile in the end.