Fixed firefox compatibility and added missing icons to feature pages (#2863)

# Description of Changes

Fixed icon incompatibility with firefox
Added missing icons to feature pages

Closes #(2833)


![image](https://github.com/user-attachments/assets/51ba008a-f6ab-4e29-9a79-99d85d152689)


---

## Checklist

### General

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

### Documentation

- [ x] 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)
- [ x] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

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

### Testing (if applicable)

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

Co-authored-by: Reece Browne <reece@stirling.pdf>

src/main/resources/static/images/redact-auto.svg

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<svg  version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
         <symbol id="icon-redact-auto" viewBox="0 0 24 24">  <g id="Layer_2" data-name="Layer 2">
     <g id="Layer_1-2" data-name="Layer 1">
       <rect width="24" height="24" style="fill: none"/>
@@ -14,4 +14,5 @@
       </g>
     </g>
   </g>
+    </symbol>
 </svg>