refactor: move images of the "runtime" module

[benjaminParisel]

The images were stored in the Antora legacy folder (assets/images) and included an extra "images" sub-folder.
All images are now in the "images" folder of the module, which is the standard Antora folder.

Covers bonitasoft/bonita-documentation-site#620

[github-actions]

📝 Contribution Summary

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🔗 Updated pages

Note

The following pages were updated, please ensure that the display is correct:

• resource-management
• runtime/admin-application-groups-list
• runtime/admin-application-overview
• runtime/admin-application-process-list
• runtime/admin-application-resources-list
• runtime/admin-application-task-list
• runtime/admin-application-users-list
• runtime/applications
• runtime/bdm-management-in-bonita-applications
• runtime/bonita-as-windows-service
• runtime/cases
• runtime/connectors-execution
• runtime/custom-user-information-in-bonita-applications
• runtime/embed-engine
• runtime/engine-architecture-overview
• runtime/execution-sequence-states-and-transactions
• runtime/import-export-an-organization
• runtime/install-a-bonita-bpm-cluster
• runtime/log-in-and-log-out
• runtime/monitoring
• runtime/overview-of-bonita-bpm-in-a-cluster
• runtime/performance-troubleshooting
• runtime/reporting-app
• runtime/user-application-case-list
• runtime/user-application-overview
• runtime/user-process-list
• runtime/user-task-list

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[tbouffard]

LGTM