DOC-5734 Remove tabs and collapsibles

[aimurphy]

Collapsibles and/or tabs were removed from the following pages, unless otherwise noted.
Scan the pages to make sure there is no exposed or broken syntax.
Focus on first group. Other changes are less intense.

More complex:

• cassandra-data-migrator
• deploy-proxy-monitoring
• manage-proxy-instances
• migrate-sideloader
• prepare-sideloader

Less complex:

• change-read-routing
• create-target
• dse-migration-paths
• enable-async-dual-reads
• metrics
• setup-ansible-playbooks
• troubleshooting-tips and new zdm-logs

Trivial:

• components: Moved "when to use migration tools" to this page.
• connect-clients-to-proxy
• connect-clients-to-target
• feasibility-checklists
• introduction
• sideloader-overview: discontinued 2 partials, pasted content directly in this file

[plpesvc-ds]

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