UI/allow logo selection (#4982)

# Description of Changes

- Allow switching between logos in-app using the same section in
settings

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/public/modern-logo/StirlingPDFLogoNoTextDark.svg

@@ -0,0 +1,4 @@
+<svg width="92" height="100" viewBox="0 0 92 100" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M0 50L60 0V46.5L0 96.5V50Z" fill="#E6E6E6" fill-opacity="0.4"/>
+<path d="M32 53L92 3V49.5L32 99.5V53Z" fill="#E6E6E6" fill-opacity="0.7"/>
+</svg>

frontend/public/modern-logo/StirlingPDFLogoNoTextLight.svg

@@ -0,0 +1,4 @@
+<svg width="92" height="100" viewBox="0 0 92 100" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M0 50L60 0V46.5L0 96.5V50Z" fill="#ACACAC" fill-opacity="0.3"/>
+<path d="M32 53L92 3V49.5L32 99.5V53Z" fill="#FC9999" fill-opacity="0.5"/>
+</svg>

frontend/public/modern-logo/logo-tooltip.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" viewBox="0 0 192 192" fill="none">
+<path d="M7.26375 95.8344L123.374 4.32822e-05L123.375 89.4987L7.26375 185.333L7.26375 95.8344Z" fill="white"/>
+<path d="M68.4794 102.395L184.728 6.44717L184.728 96.052L68.4794 192L68.4794 102.395Z" fill="white" fill-opacity="0.6"/>
+</svg>