Feature Parquet in the "Zstandard is used by :" section

[severo]

Is your feature request related to a problem? Please describe.

Parquet is not listed in the "Zstandard is used by :" section of https://facebook.github.io/zstd/

Describe the solution you'd like

Add Parquet (which uses zstd as a compression algorithm: https://parquet.apache.org/docs/file-format/data-pages/compression/) to the list.

Describe alternatives you've considered

Not listing it

[terrelln]

We'll update it next time we update the site!