chore: update links on homepage

[kim-tsao]

Description

Update the links on the Janus homepage so they point to docs rather that actual deployment instances

Which issue(s) does this PR fix

• Fixes #?
  Remove Janus links in homepage #800

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

locally tested and verified the links worked

[changeset-bot]

🦋 Changeset detected

Latest commit: f2e289c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[sonarcloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-970!

[janus-idp]

backstage-showcase Tests on commit af6f16c finished with errors.
View test log

[schultzp2020]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: schultzp2020

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[Zaperex]

/override "Showcase tests on OCP/PR Test"

[openshift-ci]

@Zaperex: Overrode contexts on behalf of Zaperex: Showcase tests on OCP/PR Test

In response to this:

/override "Showcase tests on OCP/PR Test"

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