feat: refactor lsp configs and drop nvim-cmp

after/lsp/jedi_language_server.lua

@@ -0,0 +1,14 @@
+local lsp = require("lsp")
+
+---@type vim.lsp.Config
+return {
+    on_attach = lsp.on_attach,
+    init_options = {
+        completion = {
+            disableSnippets = true,
+        },
+        diagnostics = {
+            enable = true,
+        },
+    },
+}