README.md has outdated links

[juandaherrera]

It’s a simple issue: in the repository’s README.md there are some links that lead to 404 pages. Examples:

• https://redis.io/docs/stack/json/
• https://redis.io/docs/latest/stack/search/

Some advanced features of Redis OM rely on core features from two source available Redis modules: RediSearch and RedisJSON.