themes: remove RoundFox since it was deleted

links #282

Co-authored-by: SuperCat01 <johnmclovin059@gmail.com>

Author: BeyondMagic

docs/assets/img/themes/roundfox_theme_img.webp

@@ -811,13 +811,6 @@
     "image": "assets/img/themes/snowfox.webp",
     "tags": [ "moder", "blue", "side-bookmark-bar","home page"]
   },
-  {
-    "title": "RoundFox",
-    "link": "https://github.com/GazirovanayaVoda/RoundFox",
-    "description": "Small theme to make Firefox more rounded and compact",
-    "image": "assets/img/themes/roundfox_theme_img.webp",
-    "tags": ["home page", "compact", "minimal", "blur"]
-  },
   {
     "title": "AnimatedFox",
     "link": "https://github.com/RemyIsCool/AnimatedFox",

docs/themes.json

@@ -811,13 +811,6 @@
     "image": "assets/img/themes/snowfox.webp",
     "tags": [ "moder", "blue", "side-bookmark-bar","home page"]
   },
-  {
-    "title": "RoundFox",
-    "link": "https://github.com/GazirovanayaVoda/RoundFox",
-    "description": "Small theme to make Firefox more rounded and compact",
-    "image": "assets/img/themes/roundfox_theme_img.webp",
-    "tags": ["home page", "compact", "minimal", "blur"]
-  },
   {
     "title": "AnimatedFox",
     "link": "https://github.com/RemyIsCool/AnimatedFox",