[CORL-127] Custom CSS (#2194)

* feat: moved html-webpack-plugin to custom server templates in production

* fix: fixed templates

* fix: removed sri for the time being

* fix: fixed up tests for new field name

src/core/server/models/settings.ts

@@ -80,7 +80,11 @@ export interface Auth {
 }
 
 export interface Settings extends ModerationSettings {
-  customCssUrl?: string;
+  /**
+   * customCSSURL is the URL that can be specified by the Tenant to describe a
+   * URL that contains custom styles to be applied to the Stream.
+   */
+  customCSSURL?: string;
 
   /**
    * editCommentWindowLength is the length of time (in seconds) after a comment