change: URL for install etcd-operator

[winiciusallan]

The link has a latest tag that it is not working. I've got the working link from releases page

Closes: #288

Summary by CodeRabbit

• Documentation
  • Updated the Getting Started guide to reference a fixed v0.4.0 kubectl apply URL for the prerequisite installation step, ensuring consistent setup instructions across environments.
  • Clarified that only the first prerequisite step is affected; all other steps remain unchanged.
  • No functional changes to the product or user workflows.

[coderabbitai]

Walkthrough

Updated a single getting-started documentation page to point the kubectl apply command at a fixed v0.4.0 manifest URL instead of a latest-release URL. No other steps or code were changed.

Changes

Cohort / File(s)	Summary of changes
Docs site/content/en/docs/v0.4/getting-started/_index.md	Changed kubectl apply URL in pre-requisite step 1 to target fixed v0.4.0 release manifest; no other edits.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

I hop through docs with gentle cheer,
A tiny link now crisp and clear.
From “latest” winds to “v0.4”,
The path is fixed—no guesswork more.
Thump-thump! says bunny QA bright—
Stable carrots, versions right. 🥕✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title succinctly captures the primary change of updating the installation URL for the etcd-operator and does not include extraneous details or vague wording. It clearly indicates what was changed and is aligned with the PR’s main objective of fixing a broken “latest” tag link. This makes it easy for reviewers and future readers to understand the core purpose of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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