docs: cleanup vuetify layout

[userquin]

Description

This PR moves the logic at Vuetify layout to the index.ts module, we don't need to create and mount a vue application for that.

This PR also includes:

• added animated-logo.svg back but still not being used: I need to check why the SVG only runs the animation once, on page refresh the animation is missing
• add animated-logo.svg and use it at home hero: looks like it is not working with dev server, you need to run docs:serve (build + vp preview) => there is some weird behavior, sometimes the animations are there sometimes missing (chrome, brave and firefox on Windows) when using the VP navigation or the back briwser button, on page refresh it works...
• fix theme color contrast for brand button, tip, warning, error and info blocks
• fix shiki theme color contrast (github-light theme)

Linked Issues

Additional Context

I've sent a PR to VitePress to include a new hero actions slot, this PR updates VP to v2 alpha 17 and uses the new slot home-hero-actions-before-actions to add the npx input box before VP actions list but inside actions container:
vuejs/vitepress#5151

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Tip

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[userquin]

Don't merge yet, we're adding support for Shiki colorReplacements at VitePress:
vuejs/vitepress#5153