adding

public/css/index.css

@@ -1,16 +1,16 @@
 @charset "UTF-8";
 @font-face {
   font-family: "IBM Plex Mono";
-  src: url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono.eot?85f924ecb898e5720062617e4a86f1d1);
-  src: url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono.eot?85f924ecb898e5720062617e4a86f1d1?#iefix) format("embedded-opentype"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono.woff2?db620201a437f00ce78da2a10cf50f3f) format("woff2"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono.woff?3d04ef6de65d3c77bd60c158326be298) format("woff"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono.ttf?ce51a85eb7160067d01bcf6e56f837d1) format("truetype");
+  src: url("IBMPlexMono.eot");
+  src: url("IBMPlexMono.eot?#iefix") format("embedded-opentype"), url("IBMPlexMono.woff2") format("woff2"), url("IBMPlexMono.woff") format("woff"), url("IBMPlexMono.ttf") format("truetype");
   font-weight: normal;
   font-style: normal;
   font-display: swap;
 }
 @font-face {
   font-family: "IBM Plex Mono";
-  src: url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono-Bold.eot?eb105b142ce736849ef4828cb0c8eb34);
-  src: url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono-Bold.eot?eb105b142ce736849ef4828cb0c8eb34?#iefix) format("embedded-opentype"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono-Bold.woff2?8b633c62813e0275ebd7a1c793c4e99c) format("woff2"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono-Bold.woff?b72090c625b4144f3763d5b2bf8f5942) format("woff"), url(/fonts/vendor/@tentakelfabrik/plain-ui/src/IBMPlexMono-Bold.ttf?558e55bd46468bb8d7074d7064d02c30) format("truetype");
+  src: url("IBMPlexMono-Bold.eot");
+  src: url("IBMPlexMono-Bold.eot?#iefix") format("embedded-opentype"), url("IBMPlexMono-Bold.woff2") format("woff2"), url("IBMPlexMono-Bold.woff") format("woff"), url("IBMPlexMono-Bold.ttf") format("truetype");
   font-weight: bold;
   font-style: normal;
   font-display: swap;

webpack.mix.js

@@ -39,7 +39,8 @@ mix.webpackConfig({
 mix.options({
     terser: {
         extractComments: false
-    }
+    },
+    processCssUrls: false
 })
 
 mix