Close Parquet github account to avoid confusion

The old github repo has significant history (github issues and PRs) that we'd like to maintain.
But at the same time it is confusing and people mistake it for the main repo.
We need a solution for this.

**Reporter**: [Julien Le Dem](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=julienledem) / @julienledem

_{**Note**: *This issue was originally created as [PARQUET-790](https://issues.apache.org/jira/browse/PARQUET-790). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}