add react and typescript

app/assets/stylesheets/application.css

@@ -1,27 +0,0 @@
-/*
- * This is a manifest file that'll be compiled into application.css, which will include all the files
- * listed below.
- *
- * Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
- * vendor/assets/stylesheets directory can be referenced here using a relative path.
- *
- * You're free to add application-wide styles to this file and they'll appear at the bottom of the
- * compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
- * files in this directory. Styles in this file should be added after the last require_* statement.
- * It is generally better to create a new file per style scope.
- *
- *= require_tree .
- *= require_self
- */
-
-.grid {
-  display: grid;
-}
-
-.place-items-center {
-  place-items: center;
-}
-
-.h-screen {
-  height: 100vh;
-}

app/assets/stylesheets/application.scss

@@ -0,0 +1,11 @@
+.grid {
+  display: grid;
+}
+
+.place-items-center {
+  place-items: center;
+}
+
+.h-screen {
+  height: 100vh;
+}