try to optimize a little bit the build

Author: saljuama

Diff for: .circleci/config.yml

@@ -20,6 +20,7 @@ workflows:
             - install
       - cypress/run:
           yarn: true
+          cache-key: v1-dependencies-{{ checksum "package.json" }}
           executor: cypress/base-14
           start: yarn serve
           wait-on: 'http://localhost:5000'

Diff for: .gitignore

@@ -3,6 +3,7 @@
 /build
 
 cypress/videos/
+cypress/screenshots/
 
 .eslintcache
 

Diff for: package.json

@@ -9,7 +9,7 @@
     "clean": "eslint \"src/**/*.js\" --fix",
     "start": "react-scripts start",
     "build": "react-scripts build",
-    "serve": "yarn build && serve -s build",
+    "serve": "yarn build && serve -s build -n",
     "predeploy": "yarn build",
     "deploy": "gh-pages -b gh-pages -e ./docs -d build"
   },