chore: move dist/ and /lib in root gitignore (#7032)

Author: alexnm

.gitignore

@@ -14,6 +14,8 @@ coverage
 build
 www
 .deliver
+lib/
+dist/
 
 # misc
 .DS_Store

packages/app/.gitignore

@@ -1,2 +1 @@
-lib
 public

packages/browser-dart-sass/.gitignore

@@ -1,2 +1 @@
-dist
 .cache

packages/browser-eslint-rules/.gitignore

@@ -4,4 +4,3 @@ node_modules
 .rts2_cache_cjs
 .rts2_cache_es
 .rts2_cache_umd
-dist