Use svg-toolbelt to give zoom & pan controls to mermaid diagrams #5206
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Use svg-toolbelt to give mermaid diagrams pan and zoom controls. This is especially useful since our diagrams render at a fixed width of about 760px in the manual, so any reasonably sized diagram rendered by mermaidjs is unreadable.
As an addition, when we render the mermaid code block, a code tag is no longer appropriate since we are displaying an svg instead, so I've switched out the code block for a div.