NOREF Move 5th grade to early grades category

[mwbenowitz]

Description

This moves 5th grade from the Middle to Early category to reflect standard groupings

Motivation and Context

This is to properly align the reading experience for schools using the Clever integration with Open eBooks

How Has This Been Tested?

The appropriate unit tests have been updated

Checklist:

• [x] I have updated the documentation accordingly.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ca033a1) 92.56% compared to head (509e1cb) 92.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1913 +/- ## ======================================== Coverage 92.56% 92.56% ======================================== Files 216 216 Lines 43665 43665 ======================================== Hits 40418 40418 Misses 3247 3247 ```

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