a11y menu update

[btroncone]

Closes #200

[ladyleet]

LGTM! Yay // @knittingcodemonkey

[knitcodemonkey]

Thank you, @btroncone. It would have taken me a lot longer to get to this solution.

[codecov-io]

Codecov Report

Merging #206 into master will decrease coverage by 0.29%.
The diff coverage is 75%.

@@            Coverage Diff            @@
##           master     #206     +/-   ##
=========================================
- Coverage   74.78%   74.49%   -0.3%     
=========================================
  Files           9       10      +1     
  Lines         119      149     +30     
  Branches        6        7      +1     
=========================================
+ Hits           89      111     +22     
- Misses         30       38      +8

Impacted Files	Coverage Δ
src/app/core/core.module.ts	100% <100%> (ø)	⬆️
src/app/app.component.ts	57.69% <66.66%> (+0.54%)	⬆️
src/app/core/services/operator-menu.service.ts	72.72% <72.72%> (ø)
src/app/operators/operators.component.ts	92.5% <78.57%> (-7.5%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 883ef9c...908c211. Read the comment docs.