minor readme fixes

[EvilOlaf]

as per title...

Summary by CodeRabbit

• Documentation
  • Refined Docker setup instructions for clarity
  • Added guidance for server customization references
  • Enhanced environment variable documentation with explicit threshold values

[coderabbitai]

Walkthrough

README.md documentation updated with simplified Docker usage phrasing, explicit clarification that in-game server customization guidance is out of scope with a reference to external resources, and improved memory watchdog threshold environment variable documentation with specific threshold value.

Changes

Cohort / File(s)	Summary
Documentation README.md	Simplified Docker "plain Docker" usage language; added clarification redirecting users to external resources for SCUM server customization settings; detailed memory watchdog threshold with explicit 95% value and disable option.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• add quickstart section #17: Updates Docker plain usage phrasing and quickstart guidance similar to the Docker rewording in this PR.
• Update README.md #36: Modifies MEMORY_THRESHOLD_PERCENT documentation similar to the memory watchdog clarifications in this PR.
• Update README.md #8: Adds SCUM server customization guidance and external resource references aligned with the scope clarification in this PR.

Poem

🐰 A README refreshed, so clear and bright,
Docker words simplified, memory thresholds right,
"Out of scope," we gently say,
Pointing seekers on their way! ✨

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'minor readme fixes' is vague and generic, lacking specificity about the actual changes made to the README.	Consider using a more descriptive title that highlights the main change, such as 'Clarify memory threshold docs and decomposerize reference' or 'Update README with clarified environment variable documentation'.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch EvilOlaf-patch-1

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[coderabbitai]

🧹 Nitpick comments (1)

README.md (1)

63-65: Use a concrete, known-good server settings link instead of Google.

The repo already prefers a specific resource for SCUM server settings; linking directly is clearer and avoids search ambiguity.
Based on learnings: The working alternative is https://scum.fandom.com/wiki/Server_Settings for server settings information.