feat(lsp): migrate from blink.cmp to built-in completion

after/lsp/intelephense.lua

@@ -1,5 +1,4 @@
 local Linter = require("linter")
-local lsp = require("lsp")
 local util = require("util")
 
 ---@type vim.lsp.Config
@@ -13,8 +12,6 @@ return {
         },
     },
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         Linter.add(bufnr, {
             cmd = {
                 "phpcs",