Post-release cleanup and fixes (specific to recent repository restructure) (#3290)

1) Fix poms deployment config.
2) Fix documentaiton links in readmes.
3) Update main README (remove `goolge-cloud` metapackage reference).
4) Update `RELEASING.md` to reflect changes. The instructions try to avoid having mysterious scripts running in the release process and also ensures that all disruptive operations (actual release/push) are done explicitly and not somewhere in the middle of a mysterious script.
5) Remove `deploy.sh` and `finalize_release.sh` scripts.
6) Fix few previously broken links (bigquerydatatransfer and compute apidocs links)

Author: vam-google

google-cloud-contrib/google-cloud-logging-logback/README.md

@@ -7,7 +7,7 @@ Logback appender `com.google.cloud.logging.logback.LoggingAppender` for
 This library allows you to use [Logback](https://logback.qos.ch/) configuration and the [Slf4j](https://www.slf4j.org/) interface to log via Google Cloud logging.
 
 -  [Homepage](https://googlecloudplatform.github.io/google-cloud-java/)
--  [API Documentation](https://googlecloudplatform.github.io/google-cloud-java/apidocs/index.html?com/google/cloud/logging/logback/LoggingAppender.html)
+-  [API Documentation](https://googlecloudplatform.github.io/google-cloud-java/google-cloud-clients/apidocs/index.html?com/google/cloud/logging/logback/LoggingAppender.html)
 
 > Note: This client is a work-in-progress, and may occasionally
 > make backwards-incompatible changes.

google-cloud-logging/README.md

@@ -229,4 +229,4 @@ Apache 2.0 - See [LICENSE] for more information.
 [stackdriver-logging]: https://cloud.google.com/logging/
 [stackdriver-logging-quickstart]: https://cloud.google.com/logging/docs/quickstart-sdk
 [logging-product-docs]: https://cloud.google.com/logging/docs/
-[logging-client-lib-docs]: https://googlecloudplatform.github.io/google-cloud-java/latest/apidocs/index.html?com/google/cloud/logging/package-summary.html
+[logging-client-lib-docs]: https://googlecloudplatform.github.io/google-cloud-java/google-cloud-clients/apidocs/index.html?com/google/cloud/logging/package-summary.html