feat: refactor lsp configs and drop nvim-cmp

after/lsp/cmake.lua

@@ -0,0 +1,9 @@
+local lsp = require("lsp")
+
+---@type vim.lsp.Config
+return {
+    on_attach = lsp.on_attach,
+    init_options = {
+        buildDirectory = "build",
+    },
+}