Remove link to obsolete yarn-cypress-cache example repo (#6106)

Author: MikeMcC399

docs/app/continuous-integration/overview.mdx

@@ -646,11 +646,6 @@ following:
    to your CI script. If there is a binary already present, it should finish
    quickly.
 
-See
-[bahmutov/yarn-cypress-cache](https://github.com/bahmutov/yarn-cypress-cache)
-for an example that runs the `npx cypress install` command to ensure the Cypress
-binary is always present before the tests begin.
-
 ### Xvfb
 
 When running on Linux, Cypress needs an X11 server; otherwise it spawns its own