release(v2.0.1): rebrand docs to Theta Gateway, remove standalone install paths

README no longer offers Standalone Docker / Bare metal install instructions,
which contradicted the Deployment section's own "exclusively via Docker
Compose within Theta Suite" claim. Links to sso-manager-node/theta-env's old
per-repo GitHub Pages sites now point at the unified theta-suite docs site.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

nodejs/package.json

@@ -1,6 +1,6 @@
 {
   "name": "theta-gateway",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "description": "SSH jump host for the theta42 stack — LDAP-authenticated, directory-driven host bridging with audit and metrics",
   "author": [
     {