Chinese translation link updates

[bitschmidty]

@bittomhan recently completely translating historical newsletters 0-202. Thank you @bittomhan !

Chinese newsletters translations 203-today are linking to /en/ versions where a /zh/ version is now available.

We can update newsletters 203-today in a PR with the new /zh/ links in a one time update. All future /zh/ translations should have the historical /zh/ links available moving forward.

[bittomhan]

Thank you so much for this opportunity! I’m truly honored to contribute my time to Bitcoin Optech and everyone passionate about Bitcoin. I’ve been eagerly looking forward to this moment and will continue exploring ways to contribute further.

I fully acknowledge the requirements. To ensure quality, I'll need a little more time to review and revise the content step by step. While this may take some additional effort, please rest assured that I remain fully committed to contributing to Bitcoin.

[bitschmidty]

@bittomhan my tagging you here was about thanking you while surfacing the issue/task and not assigning this to you. If you want to take it of course you can.

[bittomhan]

Thank you! I like to contribute to Bitcoin in my free time.
I will try to do this task on this weekend.