Update all "LayerCI" references to "webapp.io"

[magnolia-triplett]

Subject

Update all "LayerCI" references to "webapp.io" due to rebrand

Description

References to LayerCI to be changed to "webapp.io" are as follows: 

• docs: https://docs.cypress.io/guides/continuous-integration/ci-provider-examples#Guides
• github example: https://github.com/bahmutov/cypress-example-layerci |

[jennifer-shehane]

This was already done