Remove build and deployment information

This repository is not the correct place for this information. It is
already in the Performance Platform manual.
Fix broken condition on service detail page

There's no reason not to display the historical data just because the change
from the most recent quarter is set to None.
Fixes to historical data display
Merge pull request #147 from alphagov/bugfix-68432448-zeros-blank-lines

[#68432448] Historical data display