Doc typo: There are three ways of using Quasar -> four ways

[philpraxis]

In: https://quasar.dev/start/pick-quasar-flavour

Doc update to reflect number of options: UMD/Standalone, Quasar CLI, Quasar Vite plugin, Vue CLI plugin

There are three ways of using Quasar -> There are four ways of using Quasar

What kind of change does this PR introduce?

• Bugfix
• Feature
• Documentation
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on a Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

Other information:

[yusufkandemir]

Thanks for noticing this 👏

[philpraxis]

Pleasure to help :)