fix: gitignore (arangodb#20448)

chore: remove build folder from .gitignore

fix: gitignore

Co-authored-by: Vadim Kondratev <vadim@arangodb.com>

Author: palashkaria

.gitignore

@@ -99,7 +99,6 @@ test.cpp.txt
 js/apps/*
 !js/apps/system/
 js/apps/system/_admin/aardvark/APP/react/node_modules/
-js/apps/system/_admin/aardvark/APP/react/build/
 js/node/**/node_modules/.bin/
 js/node/node_modules/**/*.md
 !js/node/node_modules/**/LICENSE.md