Auto-generate list of grades for every GradeScale

[kevin8181]

• Auto-generate the list of grades for each scale using the json data
• Change the type of GradeScale to make the grades property required
• Reorganize src/index

The lists of grades that are manually defined in src/index do not match what's defined in the json data files. Is there a reason these are different, and would it make sense to remove these now that the grades are available on the scales directly?

[github-actions]

Coverage report

Caution

Coverage does not meet threshold
Statements coverage not met for global: expected <=999999 not covered statements, but got 630

St.❔	Category	Percentage	Covered / Total
🟢	Statements	87.87% (+0.37% 🔼)	630/717
🟡	Branches	67.54%	129/191
🟢	Functions	81.25% (+1.38% 🔼)	130/160
🟢	Lines	86.91% (+0.22% 🔼)	571/657

Test suite run success

268 tests passing in 17 suites.

Report generated by 🧪jest coverage report action from 3d19165

[musoke]

Thank you for this - I had been wanting to make some similar simplifications!
I'll need to look at it carefully since you're making some substantial changes.

[musoke]

Is this ready for review?

[kevin8181]

yep!

[kevin8181]

?

[musoke]

Thank you for the reminder to come back to this - looks good, thank you!