minor #505 Improve naming of Vue.js component (94noni)

This PR was squashed before being merged into the 2.x branch.

Discussion
----------

Improve naming of Vue.js component

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Tickets       | Fix naming (and coherence like chart.js)#... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

<!--
Replace this notice by a short README for your feature/bugfix. This will help people
understand your PR and can be used as a start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - Never break backward compatibility (see https://symfony.com/bc).
 - Features and deprecations must be submitted against branch main.
-->

coming from symfony/symfony-docs#17344 and navigated on the website demos

Commits
-------

f50567e Improve naming of Vue.js component

Author: fullstackdeveloperwebapp

ux.symfony.com/assets/vue/controllers/PackageSearch.vue

@@ -4,7 +4,7 @@
             v-model="search"
             class="form-control"
             type="search"
-            placeholder="This search is built in Vue!"
+            placeholder="This search is built in Vue.js!"
         />
 
         <div class="mt-3">

ux.symfony.com/templates/ux_packages/vue.html.twig

@@ -32,7 +32,7 @@
     {% endcomponent %}
 {% endblock %}
 
-{% block demo_title %}UX Vue{% endblock %}
+{% block demo_title %}UX Vue.js{% endblock %}
 
 {% block demo_content %}
     <div {{ vue_component('PackageSearch', {