Delete website_docs since it has moved (#4019)

* Delete website_docs since it has moved

* Remove stuttered `the`

Co-authored-by: Trask Stalnaker <[email protected]>

* Tweak markdown link ref

Co-authored-by: Trask Stalnaker <[email protected]>

Author: chalin

QUICKSTART.md

@@ -1,7 +1,5 @@
-# OpenTelemetry QuickStart
+# OpenTelemetry Quickstart
 
-Our quickstart guide has been migrated to the [OpenTelemetry documentation website](https://opentelemetry.io/docs/java/manual_instrumentation/).
+The quickstart has moved to [Manual instrumentation][] under [opentelemetry.io](https://opentelemetry.io).
 
-The source for the documentation website can be found in our [website_docs](website_docs) folder in
-this repository. If you have updates to the documentation, please open a pull request that updates the documents
-in that location. Thanks!
+[Manual instrumentation]: https://opentelemetry.io/docs/instrumentation/java/manual_instrumentation/

RELEASING.md

@@ -47,7 +47,9 @@ Next, update the
 
 Create a PR to mark the new release in README.md and CHANGELOG.md on the main branch.
 
-Finally, update the files `website_docs` directory to point at the newly released version.
+Finally, update the [website docs][] to refer to the newly released version.
+
+[website docs]: https://github.com/open-telemetry/opentelemetry-java-docs/tree/main/website_docs
 
 ## Patch Release