docs: drop the /reload-plugins step from install

[yigitkonur]

/plugin install activates the plugin right away now — claude code prints ✓ Installed codex. Plugin is now active. the moment it lands, so the /reload-plugins step in the readme is dead weight.

what i saw locally:

› /plugin marketplace add openai/codex-plugin-cc
  └ Successfully added marketplace: openai-codex

› /plugin install codex@openai-codex
  └ ✓ Installed codex. Plugin is now active.

slash commands and the codex:codex-rescue subagent were both there immediately, no reload needed. dropping the step so nobody burns a turn on a command they don't need.

readme-only change, no code touched — would appreciate a merge whenever you get a sec 🙏

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-03T17:54:31.868864Z	f9e1a2d	New commits

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