[web-app] ng-alain模版工程初始化

web-app/src/styles/theme.less

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+// You can directly set the default theme
+// - `default` Default theme
+// - `dark` Import the official dark less style file
+// - `compact` Import the official compact less style file
+@import '~@delon/theme/theme-default.less';
+
+// ==========The following is the custom theme variable area==========
+// The theme paraments can be generated at https://ng-alain.github.io/ng-alain/
+// @primary-color: #f50;