Help center: new navigation

[grossyoan]

What changed

• "Publish documentation", "Documentation experience" "Customization options", and "Changes management" are now under a section named "API documentation"
• The "Account" section has been removed
  • "User account settings" page has been deleted
  • "Billing" is now part of the "Organizations" section
• "Integrate Bump.sh with your workflow" section renamed to "CI & integrations" to have a one-line title, enhancing readability

Misc

• "Personal user account migration" page deleted: we made that migration a while ago now.
• "Hub" logo changed to match the one we have on the dashboard
• Wrong "available depending on the plan" mentions removed from pages about access management, now that it's available on every plan
• Capital letters in some multi-word titles removed

What needs to be verified/done

• sidebar.yml file deleted: it doesn't seem to be used anymore (the sidebar content is handled by `sidebars/help.yml)
• Billing page: should we change its path and add a redirect, now that it's under "Organizations"?
• How can we have all first level sections opened by default?

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