fix: Strip JSR deps before publishing and add deno.json

JSR itself does not accept 'jsr:' dependencies in package.json, remove
them in the publish workflow before publishing. Add $schema to jsr.json.

deno.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@std/cli": "jsr:@std/cli@1"
+  }
+}