🙈(frontend) ignore public/assets/fonts with stylelint

The app build can sometimes fail because stylelint
linter warns about css font files in
public/assets/fonts.
We do not need to lint these files as they are
third-party files.

src/frontend/apps/impress/.stylelintignore

@@ -0,0 +1,3 @@
+out/**/*
+public/assets/fonts/**/*
+node_modules/**/*

src/frontend/apps/impress/stylelint.config.js

@@ -5,5 +5,4 @@ module.exports = {
     'selector-class-pattern': null,
     'no-descending-specificity': null,
   },
-  ignoreFiles: ['out/**/*'],
 };