Self-host "Roboto" font assets

This change ends the project's reliance on Google Fonts as a remote font
asset host.

Roboto is released under the SIL Open Font License, Version 1.1:
https://github.com/googlefonts/roboto-3-classic/?tab=OFL-1.1-1-ov-file

The initial TTF font files were downloaded from GitHub:
https://github.com/googlefonts/roboto-3-classic/releases/tag/v3.010

Then I ran `ftcli converter ft2wf --flavor woff2` on the files from the
`web` directory to generate `woff2` files:
https://ftcli.github.io/FoundryTools-CLI/commands/ftcli_converter.html

Author: adamzap

djangoproject/scss/_utils.scss

@@ -45,6 +45,41 @@ $logo-bg-dark: #272c27;
 
 // @font-face declarations
 
+@font-face {
+    font-family: 'Roboto';
+    src: url('#{$font-path}/Roboto-Regular.woff2') format('woff2');
+    font-weight: 400;
+    font-style: normal;
+}
+
+@font-face {
+    font-family: 'Roboto';
+    src: url('#{$font-path}/Roboto-Italic.woff2') format('woff2');
+    font-weight: 400;
+    font-style: italic;
+}
+
+@font-face {
+    font-family: 'Roboto';
+    src: url('#{$font-path}/Roboto-Bold.woff2') format('woff2');
+    font-weight: 700;
+    font-style: normal;
+}
+
+@font-face {
+    font-family: 'Roboto';
+    src: url('#{$font-path}/Roboto-BoldItalic.woff2') format('woff2');
+    font-weight: 700;
+    font-style: italic;
+}
+
+@font-face {
+    font-family: 'Roboto';
+    src: url('#{$font-path}/Roboto-Light.woff2') format('woff2');
+    font-weight: 300;
+    font-style: normal;
+}
+
 @font-face {
     font-family: 'Fira Mono';
     src: url('#{$font-path}/FiraMono-Regular.woff2') format('woff2');

djangoproject/static/fonts/Roboto-Bold.woff2

@@ -39,10 +39,6 @@
 
     <title>{% block title %}The web framework for perfectionists with deadlines{% endblock %} | Django</title>
 
-    <link rel="preconnect" href="https://fonts.googleapis.com">
-    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-    <link href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,700;1,400;1,700&display=swap" rel="stylesheet">
-
     <link rel="stylesheet" href="{% static "css/output.css" %}" >
 
     <script src="{% static "js/mod/switch-dark-mode.js" %}"></script>