Rename assets-hugo directory to assets (#3259)

Now that we've dropped the old build pipeline (and an assets directory does not exist in the repo any longer, we can rename the hugo version of the assets (assets-hugo) created during the build tools migration back to simply assets.

assets/scss/_variables_project.scss

@@ -0,0 +1,41 @@
+/*
+Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+$primary: #FFF;
+$secondary: #0098D4;
+$dark: #333;
+$gray-100: #FBFBFB;
+
+$secondary-background: #E5F5FB;
+$secondary-lighter-background: #F4FaFC;
+$secondary-lightest-background: #FBFDFD;
+
+
+$warning: #FF6666;
+$note: $secondary;
+
+$note-background: $secondary-background;
+$warning-background: #FFE0E0;
+
+$table-row-alternate: $secondary-lightest-background;
+$table-row-default: $secondary-lighter-background;
+
+/*
+ Opt to serve fonts locally by overriding web-font-path to be a non-google fonts URL.
+ This is only possible with our modified docsy theme: https://github.com/matrix-org/docsy
+ */
+$web-font-path: "../css/fonts/Inter.css";
+$google_font_name: "Inter";