Slightly refactors preview script (redis-stack#52)

Author: itamarhaber

netlify.bash

@@ -1,8 +1,12 @@
 #!/bin/bash
-rm -rf redis-stack-website
+# Prepares the Netlify preview
+: ${REDIS_STACK_REPOSITORY:="github.com/redis-stack/redis-stack-website"}
+if [[ -n $PRIVATE_ACCESS_TOKEN ]]; then
+    REDIS_STACK_REPOSITORY="$PRIVATE_ACCESS_TOKEN@$REDIS_STACK_REPOSITORY"
+fi
 repo_dir=$(pwd)
-git clone --recurse-submodules https://$PRIVATE_ACCESS_TOKEN@github.com/redis-stack/redis-stack-website
-cd redis-stack-website
-pip3 install -r requirements.txt
-npm install autoprefixer
-REPO_DIR=$repo_dir REPOSITORY_URL=$REPOSITORY_URL PREVIEW_MODE=1 make netlify
+
+rm -rf website
+git clone --recurse-submodules https://$REDIS_STACK_REPOSITORY website
+cd website
+REPO_DIR=$repo_dir REPOSITORY_URL=$REPOSITORY_URL PREVIEW_MODE=1 make deps netlify