removed import of CDN stylesheet for Plex Sans + added import of HDS-generated CSS for Plex Sans & Mono

Author: didoo

showcase/app/index.html

@@ -37,6 +37,9 @@
     <link rel="stylesheet" integrity=""
       href="{{rootURL}}assets/styles/@hashicorp/design-system-power-select-overrides.css">
 
+    <!-- these are the `@font-face` declarations for the IBM Plex fonts -->
+    <link rel="stylesheet" integrity="" href="{{rootURL}}assets/styles/@hashicorp/design-system-plex-fonts.css">
+
     <!-- these styles are compiled with the Showcase -->
     <link integrity="" rel="stylesheet" href="{{rootURL}}assets/vendor.css">
     <link integrity="" rel="stylesheet" href="{{rootURL}}assets/showcase.css">
@@ -58,7 +61,7 @@
       src="https://1.www.s81c.com/common/carbon/web-components/version/v2.40.1/text-input.min.js"></script>
     <!-- This contains global styles and CSS resets too! -->
     <link rel="stylesheet" href="https://1.www.s81c.com/common/carbon/web-components/tag/latest/themes.css" />
-    <link rel="stylesheet" href="https://1.www.s81c.com/common/carbon/plex/sans.css" />
+    <!-- <link rel="stylesheet" href="https://1.www.s81c.com/common/carbon/plex/sans.css" /> -->
     <style type="text/css">
       /* Suppress custom element until styles are loaded */
       cds-badge-indicator:not(:defined),