docs: convert $(npm bin) in examples to npx (cypress-io#714)

.buildkite/pipeline.yml

@@ -15,13 +15,13 @@ steps:
 
       # if necessary, reinstall "correct" version of Cypress
       # a common situation if testing preview binary build
-      # "$(npm bin)/cypress" install --force
+      # npx cypress install --force
       #
       echo "--- Install custom Cypress version"
       npm install "$CYPRESS_NPM_PACKAGE_NAME"
 
       echo "--- Cypress version"
-      "$(npm bin)/cypress" version
+      npx cypress version
 
       echo "+++ Run Cypress tests"
       npm run test:ci:record

.gitlab-ci.yml

@@ -29,7 +29,7 @@ install:
     # useful to make sure we are not carrying around old versions
     - npx cypress cache path
     - npx cypress cache list
-    - $(npm bin)/print-env CI
+    - npx print-env CI
     - npm run cy:verify
     - npm run cy:info
 
@@ -39,7 +39,7 @@ install:
   stage: test
   script:
     # print CI environment variables for reference
-    - $(npm bin)/print-env CI
+    - npx print-env CI
     # start the server in the background
     - npm run start &
     # run Cypress test in load balancing mode

.travis.yml

@@ -26,7 +26,7 @@ cache:
 defaults: &defaults
   script:
     #   ## print all Travis environment variables for debugging
-    - $(npm bin)/print-env TRAVIS
+    - npx print-env TRAVIS
     - npm run start &
     - npm run cy:run -- --record --parallel --group $STAGE_NAME
     # after all tests finish running we need

basic/.gitlab-ci.yml

@@ -18,7 +18,7 @@ test:
   script:
     - npm ci
     # print CI environment variables for reference
-    - $(npm bin)/print-env CI
+    - npx print-env CI
     # make sure Cypress can run
     - npm run cy:verify
     # start the server in the background