Change supplier Guide to rates to show flat role prices
Change supplier Guide to rates to show flat role prices

Shows a flat list of roles, since data is not organised to display
Junior/Senior pricing table at the moment.

Roles are sorted to show Junior role before the Senior one. This is
done by sorting the list twice - first on the role (which puts all
Junior roles before all Senior ones) and then by category (which
groups related Junior and Senior roles together). Since python sort
is guaranteed to be stable the Junior role will still be before
the related Senior one.

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