[Feature] Themed Redesign for Sign-Up Page #270 (#339)

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## Issues Identification

Closes: #270

## Description

### Summary
Provide a brief description of what this pull request does and why it is
needed.

### Details
Include any detailed information about the changes in this pull request.

## Types of Changes

_Please check the boxes that apply_

- [x] Bugfix (non-breaking change that fixes an issue)
- [x] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update (Documentation content changed)
- [ ] Other (please describe):

## Checklist

_Please check the boxes that apply_

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] My changes do not break the current system and pass all existing
test cases
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules


![image](https://github.com/user-attachments/assets/67b4eb24-6533-428c-9556-255699e74ffc)


## Additional Information

Please provide any other information that is relevant to this pull
request.

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