TDigest: Add documentation of encoding design to website

[PragmaTwice]

Refer to https://kvrocks.apache.org/community/data-structure-on-rocksdb.

A sub-issue of #2558.

[PragmaTwice]

Hi @LindaSummer, I think the documentation work is, relatively more important, than the implementation of commands.

So when you have time, maybe you can first try this one : )

[LindaSummer]

Hi @LindaSummer, I think the documentation work is, relatively more important, than the implementation of commands.

So when you have time, maybe you can first try this one : )

Hi @PragmaTwice ,

Got it!😊
I'll work on the documentation first.

Best Regards,
Edward

[PragmaTwice]

Great! Thank you for your contribution!