Rewrite docs to not assume a local folder layout

The README previously described this stack as shared by "every project
under Documentos/", which is just this machine's local checkout location,
not something the repo itself should assume. Every project lives in its
own git repository; the path to this repo's checkout is a per-project
setting (ZITADEL_ADMIN_PAT_DIR), not a fixed convention.

Also drops leftover em dashes across the docs and compose comments for
plainer prose.

.env.prod.example

@@ -1,6 +1,6 @@
-# Production configuration for compose.yml (no overlay needed — the base
-# file is already the production shape: no published ports, everything
-# reachable only on infra-net).
+# Production configuration for compose.yml (no overlay needed: the base
+# file is already the production shape, with no published ports and
+# everything reachable only on infra-net).
 #
 #   cp .env.prod.example .env.prod
 #   chmod 600 .env.prod