NO-ISSUE: Update README with testing image instructions, TOC

[yoavsc0302]

Description

This PR updates the README.md file with the following improvements:

• Added missing Table of Contents (ToC) headlines for better navigation.
• Added instructions for updating the assisted-service image in a running deployment:
  • Using oc set image to update the deployment.
  • Handling same-tag updates with oc rollout restart and oc delete pods.
  • Verification steps to ensure the new image is applied.
  • Summary section for quick reference.

Why?

• The README previously lacked instructions on how to update the assisted-service image in a running environment.
• Some important sections were missing from the ToC, making navigation harder.

[openshift-ci-robot]

@yoavsc0302: This pull request explicitly references no jira issue.

In response to this:

Description

This PR updates the README.md file with the following improvements:

• Added missing Table of Contents (ToC) headlines for better navigation.
• Added instructions for updating the assisted-service image in a running deployment:
• Using oc set image to update the deployment.
• Handling same-tag updates with oc rollout restart and oc delete pods.
• Verification steps to ensure the new image is applied.
• Summary section for quick reference.

Why?

• The README previously lacked instructions on how to update the assisted-service image in a running environment.
• Some important sections were missing from the ToC, making navigation harder.

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[openshift-ci]

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[danmanor]

Should probably work without destroy no ?

[danmanor]

I believe these instructions should be located in some file called dev.md or something similar. This README.md is too long already. Maybe we can add a pre-issue to this issue about splitting the README.md file to multiple files inside a docs directory ? @AlonaKaplan WDYT ?

[AlonaKaplan]

We can have a ref from here to another file to avoid this README to be even longer.