changing url (#3889)

Author: jason-ford-codecov

.env.development

@@ -1,6 +1,6 @@
 PROXY_TO=https://stage-api.codecov.dev
 REACT_APP_API_URL=https://stage-api.codecov.dev
-REACT_APP_BASE_URL=https://stage-web.codecov.dev
+REACT_APP_BASE_URL=https://stage-app.codecov.dev
 REACT_APP_MARKETING_BASE_URL=https://about.codecov.io
 # REACT_APP_STRIPE_KEY=
 # REACT_APP_LAUNCHDARKLY=