Add alt text to back button

[CollinWoo]

Summary

This pull request adds alt text to the chevron button that takes users from the employee details page back to the employees list page.

• Added alt text to the chevron image for the back button
• Documented the compRides() function

Test Plan

Testing was conducted by using inspect element on the back button on the employee details webpage and verifying that the image has the alt attribute with the appropriate text:

[dti-github-bot]

[diff-counting] Significant lines: 15.

[pratyush1712]

thank you for adding documentation! could you change the alt text from "Employees" to "Back to Employees List" because that makes more sense for the back buttton here. also, could you also make sure all the back buttons on the site has alt text (i think there might be more than just the employees button)