File paths dynamic (#2605)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] 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)

---------

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Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/config/WebMvcConfig.java

@@ -23,7 +23,8 @@ public class WebMvcConfig implements WebMvcConfigurer {
     public void addResourceHandlers(ResourceHandlerRegistry registry) {
         // Handler for external static resources
         registry.addResourceHandler("/**")
-                .addResourceLocations("file:customFiles/static/", "classpath:/static/");
+                .addResourceLocations(
+                        "file:" + InstallationPathConfig.getStaticPath(), "classpath:/static/");
         // .setCachePeriod(0); // Optional: disable caching
     }
 }