chore(web): add tailwindcss

Signed-off-by: SphericalKat <amolele@gmail.com>

assets/css/app.css

@@ -1,4 +1,8 @@
 /* This file is for your main application css. */
+@import "tailwindcss/base";
+@import "tailwindcss/components";
+@import "tailwindcss/utilities";
+
 @import "./phoenix.css";
 
 /* Alerts and form errors */