[SE-3722] Make clear that app servers should not be modified manually

This PR is about clarifying that OCIM app servers should be immutable.

This PR also ensures we use OCIM instead of Ocim since abbreviations should be uppercase.

Discussions: #12 (closed)

Dependencies: None

Screenshots:

Sandbox URL: N/A

Merge deadline: None

Testing instructions:

1. Proofread
2. Check the screenshot attached

Author notes and concerns:

1. How should we update the onboarding course? Simply import the course over the existing one, or is it done by some automation?

Reviewers

• @FoxyFoxie