refactor: no reactivity transform

[patak-dev]

Vue removed the experimental reactivity transform, and we would like Elk to dual as a learning tool for Vite, Nuxt, and Vue, so it is better we align with Vue's decision here.

After this PR, we'll update Vue to latest, before attempting to update Nuxt.

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[patak-dev]

For reference, @shuuji3 also said it tested basic UI functionalities in Discord and the app seems to be working fine

[haayman]

I'm seeing that it's no longer visible that a toot is a reply. It seems this is the only recent change that might cause this

[patak-dev]

Would you open a new issue @haayman? With a link to that toot

[haayman]

done. #2608
No link to any toot though because it only shows in your own main timeline, so a direct link is useless.