CDN vue-instantsearch plugin does not have the `install` function

[amit-ksh]

Description VueInstantSearch for Vue3 does not behave as a Vue plugin since it is not a function or has an install function. For making, it works properly, additional steps are to be taken as mentioned in the quick start code

Sample Code

1. Go to https://codepen.io/amit-ksh/pen/jOvMEEw
2. See the warnings in the console

Expected behavior Plugin should be a function or have an install function

Current behavior Not behaves as a Vue plugin

Environment:

• vue-instantsearch version: 4.5.0
• Vue.js version: 3.0.0