Cloud integration documentation update

[enolfc]

Summary

Update the cloud integration documentation to:

• Clarify requirements, reference site certification as required steps,
• Move to catch-all cloudkeeper by default, so removing references to it
• Remove references to legacy Check-in (pre Keycloak) as it's been deprecated
• Improve the description of GOCDB registration

What's missing:

• Update the accounting to not reference the appliance
• Update the cloud-info page to move to catch-all by default

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Related issue :

[enolfc]

Will progress slowly with the different sections, but already as draft PR to be able to visualise and comment

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[github-actions[bot]]

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[github-actions[bot]]

Documentation preview deployed!

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[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/623

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/623

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/623

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/623

[github-actions[bot]]

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[enolfc]

Rebased on top of #628

[enolfc]

Ready for review, let's have improvements in coming PRs

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[gwarf]

Ready for review, let's have improvements in coming PRs

Would you be willing to add a list of the main changes in the PR description? It would help review them when goring through the rendered stuff, and it will also be used as the commit message when merging the PR.

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[github-actions[bot]]

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