remove local build cache

Author: zeitlinger

.gitignore

@@ -11,7 +11,6 @@ target
 **/build/
 **/generated/
 examples/**/build/
-build-cache/
 
 # Eclipse #
 ###########

docs/contributing/running-tests.md

@@ -48,12 +48,7 @@ To ignore warnings, formatting issues, or other non-fatal issues in tests, use
 ./gradlew test -Ddev=true -x spotlessCheck -x checkstyleMain
 ```
 
-The `dev` flag
-
-- will ignore warnings in tests
-- will use a local build cache, which can speed up the build
-
-The local build cache is also useful for other commands, such as `./gradlew spotlessApply -Ddev=true`.
+The `dev` flag will ignore warnings in tests.
 
 ## Smoke tests