Add alt text to HomeScreenA and LoginA

[gabrielhicks]

Related Issue

Fixes #60

Checklist:

• [x] I have read the contributor's guide.
• [x] I linked an issue in the previous section
• [x] I have commented on the linked issue
• [x] I was assigned the linked issue (not required)
• [x] I have tested the change to the best of my ability against the sandbox or a local build.
• [x] All my images have appropriate alt tags

Optional items:

• [ ] My change adds new text and requires a change to translations.

• [ ] I was not able to test... (explain below, e.g. you did not have permissions to test a specific feature)

• [ ] This change depends O-FISH Realm repository changes (explain below)

• [ ] This change depends O-FISH Web repository changes (explain below)

• Optional: Add any explanations here

• Optional: Add any relevant screenshots here

[gabrielhicks]

60

[Sheeri]

Congratulations! 🎉 🙌 🎆 ㊗️

This PR is great and has been merged into the code. Thanks so much for contributing! If you'd like, you can request to work on another issue. We really appreciate your effort!