Move lsp config to local file structure

.config/nvim/lsp/sixtyfps.lua

@@ -0,0 +1,25 @@
+---@brief
+---
+--- https://github.com/sixtyfpsui/sixtyfps
+--- `SixtyFPS`'s language server
+---
+--- You can build and install `sixtyfps-lsp` binary with `cargo`:
+--- ```sh
+--- cargo install sixtyfps-lsp
+--- ```
+---
+--- Vim does not have built-in syntax for the `sixtyfps` filetype currently.
+---
+--- This can be added via an autocmd:
+---
+--- ```lua
+--- vim.cmd [[ autocmd BufRead,BufNewFile *.60 set filetype=sixtyfps ]]
+--- ```
+---
+--- or by installing a filetype plugin such as https://github.com/RustemB/sixtyfps-vim
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'sixtyfps-lsp' },
+  filetypes = { 'sixtyfps' },
+}