[Portal] Fix: updates broken-links on nebula sessions docs

[anthonykimani]

PR-Codex overview

This PR updates the documentation in the page.mdx file for sessions in the application. It modifies the API reference links to include the /nebula prefix, ensuring consistency in the endpoint URLs.

Detailed summary

• Changed API reference links to include /nebula in the following endpoints:
  • Create Session
  • Get Session
  • Clear Session
  • Update Session
  • Delete Session
  • List Sessions
• Retained the description about session persistence.

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[jnsdls]

thanks @anthonykimani