OP: add 'about' links to main Redis CE/Stack installation page (#1307)

Author: dwdougherty

content/operate/oss_and_stack/install/_index.md

@@ -11,7 +11,7 @@ title: Install Redis or Redis Stack
 weight: 30
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-You can install [Redis]({{< relref "/operate/oss_and_stack/" >}}) or [Redis Stack]({{< relref "/operate/oss_and_stack/" >}}) locally on your machine. Redis and Redis Stack are available on Linux, macOS, and Windows.
+You can install [Redis](https://redis.io/about/) or [Redis Stack](https://redis.io/about/about-stack/) locally on your machine. Redis and Redis Stack are available on Linux, macOS, and Windows.
 
 Here are the installation instructions: