Remove remaining `@kestra-io/ui-libs` references

`ui-libs` is sunsetting - all components have been moved to `ui/packages` in the OSS repo. The following references need to be migrated or removed:

- `astro.config.mjs`
- `package.json`
- `package-lock.json`
- `src/loaders/plugins.ts`
- `src/composables/usePluginsCount.ts`
- `src/components/MDCParserAndRenderer.vue`
- `src/components/MDCParserAndRenderer.astro`
- `src/components/layout.astro`
- `src/components/blueprints/Topology.client.vue`
- `src/components/careers/Positions.vue`
- `src/components/common/PluginsBlock.astro`
- `src/components/common/PluginsBox.astro`
- `src/components/common/SocialsList.vue`
- `src/components/docs/NavToc.vue`
- `src/components/layout/FeaturePlugins.astro`
- `src/components/plugins/OneHeader.astro`
- `src/components/plugins/PluginCard.vue`
- `src/components/plugins/PluginElements.vue`
- `src/components/plugins/PluginsMDCRender.vue`
- `src/components/plugins/PluginsIndexWrapper.vue`
- `src/components/plugins/SubgroupView.astro`
- `src/components/plugins/sidebar/PluginSidebar.vue`
- `src/components/plugins/sidebar/RightSideBar.vue`
- `src/components/plugins/similar-plugins/SimilarPlugins.astro`
- `src/components/plugins/versions/OverviewPanel.vue`
- `src/components/plugins/versions/Versions.vue`
- `src/components/price/PlanTable.astro`
- `src/pages/features/code-in-any-language/index.astro`
- `src/pages/features/code-in-any-language/julia.astro`
- `src/pages/features/code-in-any-language/python.astro`
- `src/pages/features/code-in-any-language/r.astro`
- `src/pages/meta/plugins/[...slug].svg.ts`
- `src/pages/meta/plugins/group-[cls].svg.ts`
- `src/pages/meta/plugins/plugin-[name].svg.ts`
- `src/pages/overview.astro`
- `src/pages/plugins/[...slug].astro`
- `src/pages/plugins/index.astro`
- `src/pages/sitemap/plugins.xml.ts`
- `src/utils/plugins/aliasMapping.ts`
- `src/utils/plugins/all.ts`
- `src/utils/plugins/buildPluginPageProps.ts`
- `src/utils/plugins/fetchPluginPageData.ts`
- `src/utils/plugins/generateNavigation.ts`
- `src/utils/plugins/generateSidebarPluginData.ts`
- `src/utils/plugins/nuxtBlocks.ts`
- `src/utils/plugins/pluginCount.ts`
- `src/utils/plugins/pluginUtils.ts`
- `src/utils/plugins/pruneForClient.ts`
- `src/utils/plugins/subgroupMatcher.ts`
- `src/utils/plugins/types.ts`

Start by reviewing the listed astro.config.mjs, package manifests, loaders, components, pages, and src/utils/plugins files, then compare their references with the replacements in ui/packages. Trace each reference to determine whether it should be migrated or removed. Done means the listed files no longer depend on @kestra-io/ui-libs and the affected plugin and documentation pages remain consistent.

Written by the indexing model from the issue text.