Added Deep Purple theme and fixed a phrase on Kagi Courvix Dark Theme (#814)

* Add files via upload

The Last Envoy - deep purple Kagi Theme

* Update custom-css.md

Added Deep Purple Theme and fixed the mention of Dark Mustard theme on Kagi Courvix Dark Theme .

Author: TheLastEnvoy

docs/kagi/features/custom-css.md

@@ -24,14 +24,26 @@ Once applied, the theme will instantly update Kagi's appearance. You can switch
 
 **Note:** Some themes might work better with a certain Dark Mode or Light Mode default theme selected in the [**Appearance Settings**](https://kagi.com/settings?p=appearance) page.
 
+### Deep purple
+by [TheLastEnvoy](https://github.com/TheLastEnvoy)
+
+[**Get it**](https://gist.github.com/TheLastEnvoy/2e9c7723b7e35a9f1bdb8e78e117d194)
+
+| ![Deep Purple Theme](./themes/media/deep_purple_desktop_1.png){ data-zoomable width="350px" style="display: block; margin: 0 auto" } | ![Deep Purple Theme](./themes/media/deep_purple_desktop_2.png){ data-zoomable width="350px" style="display: block; margin: 0 auto"} |
+|---:|---:|
+| ![Deep Purple Theme](./themes/media/deep_purple_mobile_1.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} | ![Deep Purple Theme](./themes/media/deep_purple_mobile_2.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} |
+
+<br>
+
+
 ### Kagi Courvix Dark
 by [Jeyso215](https://github.com/jeyso215)
 
 [**Get it**](https://gist.github.com/Jeyso215/76fd67b17d2407aa91a619fabc665887)
 
 | ![Kagi Courvix Dark Theme](./themes/media/results-page.png){ data-zoomable width="350px" style="display: block; margin: 0 auto" } | ![Kagi Courvix Dark Theme](./themes/media/search-home.png){ data-zoomable width="350px" style="display: block; margin: 0 auto"} |
 |---:|---:|
-| ![Kagi Courvix Dark Theme](./themes/media/results-page.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} | ![Dark Mustard Theme](./themes/media/search-home.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} |
+| ![Kagi Courvix Dark Theme](./themes/media/results-page.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} | ![Kagi Courvix Dark Theme](./themes/media/search-home.png){data-zoomable width="100px" style="display: block; margin: 0 auto"} |
 
 <br>