minor update installation methods

[dixudx]

Related issue

Proposed Changes

Minor update the installation part for better guidance, especially for beginners.

Checklist

• I have read the contributing guidelines.
• I have inspected the website preview for accuracy.
• [] I have signed off my issue.

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Thanks for opening your first Pull Request here! Please check out our Contributing guidelines and confirm that you Signed off.

[dixudx]

cc @realshuting @JimBugwadia

[realshuting]

/lgtm

[dixudx]

/retest

[JimBugwadia]

The changes look good, but there seem to be some errors due to broken links.

Should we create a separate issue for that?

## Errors per input

### Errors in content/en/policies/other/mitigate-log4shell/mitigate-log4shell.md

* [404] [https://logging.apache.org/log4j/2.x/security.html](https://logging.apache.org/log4j/2.x/security.html) | Failed: Network error: Not Found

### Errors in content/en/_index.md

* [ERR] [https://bestpractices.coreinfrastructure.org/projects/5327](https://bestpractices.coreinfrastructure.org/projects/5327) | Failed: Network error: error sending request for url (https://www.bestpractices.dev/projects/5327)
* [ERR] [https://bestpractices.coreinfrastructure.org/projects/5327/badge](https://bestpractices.coreinfrastructure.org/projects/5327/badge) | Failed: Network error: error sending request for url (https://www.bestpractices.dev/projects/5327/badge)

[JimBugwadia]

Created #1340.

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