fix(site): honest decentralization copy — community servers, not 'no server'

The landing claimed seeds spread 'with no server in the middle' and the About
page said people communicate 'directly with each other', while sharing in fact
travels through community relays. Reworded (en/es/pt, docs sources + generated
about pages via build-legal.sh): what you share travels through community
servers run by people and collectives — many of them, anyone can add one, none
a controllable center.

docs/what-is-tane.md

@@ -39,9 +39,10 @@ still do it with notebooks and spreadsheets.
 - **Your data is yours.** Your information is kept on **your own phone**, protected with a
   key, not on some company's computers. We don't sell it or upload it anywhere. No ads.
 - **No one can shut it down or control it.** There's no central computer that everything
-  passes through: people communicate **directly with each other**, like passing seeds from
-  hand to hand. So no one can censor it or charge you to use it (that's what being
-  **decentralized** means).
+  passes through: what you share travels over **community servers**, run by people and
+  collectives — there are many, and anyone can add their own — so none of them is a center
+  that could censor it or charge you to use it, like passing seeds from hand to hand
+  (that's what being **decentralized** means).
 - **You trust by word of mouth.** You deal with people you know and with those vouched for
   by people you trust — the way it's always worked in a village or at a fair — without
   having to give your real name or phone number unless you want to.