[OSDOCS-12093]: Adding HCP content to 4.17 Welcome

[lahinson]

Version(s): 4.17 only

Issue: https://issues.redhat.com/browse/OSDOCS-12093

Link to docs preview: https://84101--ocpdocs-pr.netlify.app/openshift-enterprise/latest/welcome/learn_more_about_openshift.html#self-managed-hcp

QE review:

• [ ] QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Wed Nov 06 22:00:20 - Prow CI generated the docs preview:

https://84101--ocpdocs-pr.netlify.app/openshift-enterprise/latest/welcome/learn_more_about_openshift.html

[lahinson]

@xenolinux - When you're back from PTO next week, PTAL at the Welcome page and let me know if you think I should highlight different topics or any additional topics. Thank you!

[jiezhao16]

/lgtm

[mburke5678]

@lahinson Just one comment. Otherwise LGTM

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.

[openshift-ci[bot]]

@lahinson: all tests passed!

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