fix(typst)!: remove the outdated .vim plugin; configure treesitter

[monoid-kitty]

the outdated plugin (kaarmu/typst.vim) bricks some formatting provided by the LSP (tinymist)

📑 Description

Not only is there no need to use workaround code highlighting provided by the said plugin (there is Treesitter now!) and other its features (because a proper LSP does most of it), but also the old plugin somehow broke formatting provided by the LSP for me.

📖 Additional Information

[github-actions]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• Entry returns a single plugin spec with the new plugin as the only top level spec (not applicable for recipes or packs).

• Proper usage of opts table rather than setting things up with the config function.

• Proper usage of specs table for all specs that are not dependencies of a given plugin (not applicable for recipes or packs).

[monoid-kitty]

if anyone want to see what behavior it fixes:

repro.lua

-- save as repro.lua
-- run with nvim -u repro.lua
-- DO NOT change the paths
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs { "config", "data", "state", "runtime", "cache" } do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  -- stylua: ignore
  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable", lazypath })
end
vim.opt.rtp:prepend(vim.env.LAZY or lazypath)

-- install plugins
local plugins = {
  { "AstroNvim/AstroNvim", version = "^5", import = "astronvim.plugins" },
  { "AstroNvim/astrocommunity", version = "^20", { import = "astrocommunity.pack.typst" } },

  -- add any other plugins/customizations here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

-- add anything else here (autocommands, vim.filetype, etc.)

how to reproduce

1. nvim -u repro.lua main.typ
2. type #let project() = { (the closing bracket will be auto-completed, and press enter, so that it looks like this:

#let project() = {
         // cursor here [9 space chars]
}

expected

by default (and I've tried to set this manually) the LSP (tinymist) uses 2 spaces for indending. but neovim forces me to use 9

after the said changes it becomes:

#let project() = {
  // cursor here [2 space chars]
}

[azdanov]

I made it a breaking change since that plugin did offer some extra functionality that might "break" people's workflow.