Revert to printf CNAME, add BUILDINFO file

Author: Andrej730

.github/workflows/bonsai-docs.yml

@@ -24,9 +24,9 @@ jobs:
           git -C bonsaibim_org_docs checkout -B main
           rm -rf bonsaibim_org_docs/*
           cp -r _build/html/* bonsaibim_org_docs/
-          echo "docs.bonsaibim.org" > bonsaibim_org_docs/CNAME
-          echo "<!-- Generated for Bonsai -->" >> bonsaibim_org_docs/index.html
+          printf "docs.bonsaibim.org" > bonsaibim_org_docs/CNAME
           touch bonsaibim_org_docs/.nojekyll
+          echo "bonsai" > bonsaibim_org_docs/BUILDINFO
           git -C bonsaibim_org_docs add .
           git -C bonsaibim_org_docs commit -m "Build"
           git -C bonsaibim_org_docs push