SHS 5095 Theming User Login Page

[mndonx]

READY FOR REVIEW

Summary

This PR disables the module the uses the admin theme for the user login page and adjusts the theming to improve the page's appearance.

Urgency

medium

Steps to Test

1. Visit the user login page, like https://hs-colorful.suhumsci.loc/user/login
2. Ensure that the page is using the custom theme, and not Gin Admin theme.
3. Ensure the there is only one title, the box-shadows have been removed, and the title is black (and not a light gray.)

PR Checklist

• PR Checklist
• Humsci Basic PR Checklist

[cienvaras]

@mndonx Module should be disabled in the Drupal config before removing it from composer.json. Actually, I thing we need to do the Drupal config part in this part and the module removal later in another PR, to prevent errors during install.

[mndonx]

@cienvaras Sorry about that, I added those lines back in the composer files and exported config. Ready for review again.

[mndonx]

@cienvaras I added a part two #1401 PR for removing the module after it has been disabled.

[cienvaras]

Looks good, thanks!