Finish removing lesshat

.stylelintignore

-**/lesshat.less
-**/_lesshat.import.less
\ No newline at end of file

.stylelintrc

@@ -107,6 +107,5 @@
 		"value-list-comma-space-after": "always-single-line",
 		"value-list-comma-space-before": "never",
 		"value-list-max-empty-lines": 0,
-	},
-	"ignoreFiles": "packages/rocketchat-livechat/app/client/stylesheets/utils/_lesshat.import.less"
+	}
 }

packages/rocketchat-theme/server/server.js

@@ -55,7 +55,7 @@ RocketChat.theme = new class {
 	constructor() {
 		this.variables = {};
 		this.packageCallbacks = [];
-		this.files = ['server/lesshat.less', 'server/colors.less'];
+		this.files = ['server/colors.less'];
 		this.customCSS = '';
 		RocketChat.settings.add('css', '');
 		RocketChat.settings.addGroup('Layout');