Refactor: use vim 0.12 built-in package manager.

- removes lazyvim
- updates cmp config

.config/nvim/after/plugin/lsp.lua

@@ -1,46 +0,0 @@
-local lsp_zero = require('lsp-zero')
-
--- Attach keybindings on LSP connection
-local lsp_attach = function(client, bufnr)
-    lsp_zero.default_keymaps({
-        buffer = bufnr
-    })
-end
-
-lsp_zero.extend_lspconfig({
-    lsp_attach = lsp_attach,
-    capabilities = require('cmp_nvim_lsp').default_capabilities()
-})
-
--- Configure diagnostic signs natively for Neovim v0.11+
-vim.diagnostic.config({
-    signs = {
-        text = {
-            [vim.diagnostic.severity.ERROR] = '✘',
-            [vim.diagnostic.severity.WARN] = '▲',
-            [vim.diagnostic.severity.HINT] = '⚑',
-            [vim.diagnostic.severity.INFO] = '»'
-        }
-    }
-})
-
-require('mason').setup({})
-require('mason-lspconfig').setup({
-    ensure_installed = {'lua_ls', 'ts_ls', 'eslint', 'gopls', 'rust_analyzer'},
-    handlers = {function(server_name)
-        -- Map legacy server names to their modern equivalents
-        if server_name == 'tsserver' then
-            server_name = 'ts_ls'
-        end
-
-        -- Verify the server configuration is accessible to prevent indexing errors
-        local has_config, _ = pcall(function()
-            return require('lspconfig')[server_name]
-        end)
-        if has_config then
-            require('lspconfig')[server_name].setup({})
-        else
-            vim.notify("LSP configuration not accessible for: " .. server_name, vim.log.levels.WARN)
-        end
-    end}
-})

.config/nvim/after/plugin/nvim-cmp.lua

@@ -1,11 +0,0 @@
-local cmp = require('cmp')
-
-cmp.setup({
-  mapping = cmp.mapping.preset.insert({
-    ['<CR>'] = cmp.mapping.confirm({select = false}),
-  }),
-  preselect = 'item',
-  completion = {
-    completeopt = 'menu,menuone,noinsert'
-  },
-})