feat: Drop svelte from neovim config

The hype has died down and React has emerged victorious, as expected, in
a battle that never started.

Joking aside, I don't remember the last time I've seen a svelte app
and even if I *did* come across one, I'd much rather work with standard
file types like TypeScript and TSX, of which this neovim config has
first-class support for.

home/neovim.nix

@@ -584,7 +584,6 @@ in
       vim-crystal
       vim-nix-rummik
       fcitx-vim
-      vim-svelte
       typst-vim
       emmet-vim
       tagbar