Fix mutation observer and testing

[borosr]

We added a demo application to the project, which is using Vue 3 to demonstrate how guardian works, it shows the caught values. Also added cypress to the project and it is testing guardian through the demo app.

[PumpkinSeed]

I tried the demo with the commands from the read me, but it's not working:

Uncaught ReferenceError: Guardian is not defined
    at (index):13:9

Probably it doesn't know what is localhost:4173

[borosr]

@PumpkinSeed thank you for the feedback, we probably missed to update the readme with the proper command. Meanwhile, you can try with with the following commands:

npm install
npm run demo:install
npm run build
npm preview # this command will block your terminal, please open a new tab to continue
npm run demo:dev # this command will block your terminal, please open a new tab to continue

Running the cypress tests:

npm run cypress:open
# or, to run tests in headless mode
npx cypress run --headless -b chrome 

[PumpkinSeed]

Remove API keys from everywhere.