[Vue] UX Vue.js example for ux.symfony.com

[t-richard]

Q	A
Bug fix?	no
New feature?	not really
Tickets	None
License	MIT

This adds the Vue.js component to ux.symfony.com

Some highlights from this PR:

• Samples are the same as the react ones, just written in Vue.js 3
• Used the Vue composition API since it's Vue 3 only and it's the new recommended syntax
• Used a composer local repository to link to the UX Vue.js component while it's not published on packagist, making this PR usable as is locally
• Changed the gradient for React to use a color closer to the "React blue"
• Used a similar gradient with the "Vue.js green"
• Fixed failing test on the Live component page

Pages screenshots

Homepage

Vue.js page

Vue.js page with a search

Vue.js page with an empty search

[tgalopin]

You can rebase now it's merged

[t-richard]

Rebased, I will update the PR to use the published version once it's live on packagist.

[weaverryan]

It's up on packagist now - there's not a release yet, but that's ok - we target 2.x-dev on all the packages anyways.

[t-richard]

I saw it was on packagist but didn't realized all packages were required with 2.x-dev.

I'll update this, thanks for the heads up.

[weaverryan]

Check that out https://ux.symfony.com/vue 😎

Thanks Thibault!