docs: restructure OSS section as bullets, drop redundant link

Make the OSS-vs-Platform comparison more scannable by giving each
side its own bullet list (CLI/HTTP API on one side, web UI / bots /
triage on the other). Remove the duplicate holmesgpt.dev link — the
GitHub link earlier in the paragraph is enough.

https://claude.ai/code/session_019GQrc8wVq14if8f7F3pp4f

Author: claude

docs/how-it-works/oss-vs-saas.rst

@@ -25,7 +25,12 @@ The SaaS Platform is `free to get started <https://home.robusta.dev/pricing>`_,
 Open Source
 ^^^^^^^^^^^^
 
-`HolmesGPT <https://github.com/robusta-dev/holmesGPT>`_ — the SRE agent at the core of Robusta — is MIT-licensed and a CNCF sandbox project. Standalone HolmesGPT is CLI- and HTTP-API-only. See `holmesgpt.dev <https://holmesgpt.dev/>`_ for standalone usage.
+`HolmesGPT <https://github.com/robusta-dev/holmesGPT>`_ — the SRE agent at the core of Robusta — is MIT-licensed and a CNCF sandbox project.
+
+Standalone HolmesGPT:
+
+- CLI only — no web UI
+- HTTP API for programmatic access
 
 The Robusta Platform (SaaS or Self-Hosted) adds on top: