adjust gitignore for generated files

projects/project-3/frontend/.gitignore

@@ -4,15 +4,11 @@
 /dist
 /tmp
 /out-tsc
-*.css
-*.css.map
+**/*.css
+**/*.css.map
 # Only exists if Bazel was run
 /bazel-out
 
-# exclude generated css-files
-/src/app/map/*.css.map
-/src/app/map/*.css
-
 # dependencies
 /node_modules
 
@@ -38,7 +34,7 @@ speed-measure-plugin*.json
 .history/*
 
 # misc
-/.sass-cache
+**/.sass-cache
 /connect.lock
 /coverage
 /libpeerconnection.log