docs: keep Hermes in installation navigation

Add Hermes Agent to the installation entries in the table of contents. The removed Quickstart section was the README's only direct link to that existing installation section, so preserving the link avoids a navigation regression.

README.md

@@ -20,6 +20,7 @@ Superpowers is a complete software development methodology for your coding agent
   - [Kimi Code](#kimi-code)
   - [OpenCode](#opencode)
   - [Pi](#pi)
+  - [Hermes Agent](#hermes-agent)
 - [The Basic Workflow](#the-basic-workflow)
 - [Community](#community)
 - [What's Inside](#whats-inside)