refactor(lsp)!: use vim.lsp.config; drop generic LSP features - #10

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, leafo/gh-actions-lua@v10, leafo/gh-actions-luarocks@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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gh-actions-lua: Storing into cache: lua:5.1.5:linux:x64: