Refactor hack script due to multistage building

hack/libhack/challenge.sh

@@ -14,11 +14,11 @@ source "${libhack_dir}/common.sh"
 
 challenge::build() {
     pushd "${CHALLENGE_PATH}"
-    args="--build-arg NOFRONTEND=1" build_challenge_internal
+    args="" build_challenge_internal
     popd
 }
 
-challenge::build_with_frontend() {
+challenge::build_no_cache() {
     pushd "${CHALLENGE_PATH}"
     args="--no-cache" build_challenge_internal
     popd

hack/libhack/frontend.sh

@@ -1,14 +0,0 @@
-# Requires context:
-#     - FRONTEND_PATH: absolute path of frontend repo
-#     - CHALLENGE_PATH: absolute path of challenge repo
-
-
-frontend::run() {
-    local frontend_in_challenge="${CHALLENGE_PATH}/solvable/frontend"
-    if [[ "$(find "${frontend_in_challenge}" | wc -l)" -gt 2 ]];then
-        cd "${frontend_in_challenge}"
-    else
-        cd "${FRONTEND_PATH}"
-    fi
-    yarn start
-}