New logo for rewrite-clj drafted: https://github.com/lread/rewrite-cljc-playground/issues/69

I’m migrating to the rewrite-clj namespace in a branch. This is where I’ll prep for a merge to clj-commons/rewrite-clj. I’ll likely not merge this branch to rewrite-cljc-playground main branch to avoid confusing anyone still using rewrite-cljc-playground.