refactor: restructure init.lua to use lazy plugin manager and add lsp configurations

lua/plugins/completion.lua

@@ -0,0 +1,58 @@
+return {
+	-- snippets
+	{
+		"L3MON4D3/LuaSnip",
+		version = "*",
+		dependencies = { "rafamadriz/friendly-snippets" },
+		config = function()
+			require("luasnip.loaders.from_vscode").lazy_load()
+		end,
+	},
+
+	-- completion
+	{
+		"saghen/blink.cmp",
+		version = "*",
+		dependencies = {
+			"L3MON4D3/LuaSnip",
+		},
+		config = function()
+			require("blink.cmp").setup({
+				completion = {
+					list = {
+						selection = {
+							preselect = false,
+							auto_insert = true,
+						},
+					},
+					documentation = {
+						window = { border = "rounded" },
+						auto_show = true,
+						auto_show_delay_ms = 50,
+					},
+					menu = {
+						border = "rounded",
+					},
+				},
+				signature = {
+					window = { border = "rounded" },
+				},
+				sources = {
+					default = { "lsp", "path", "snippets", "buffer" },
+					providers = {},
+				},
+				snippets = { preset = "luasnip" },
+				keymap = {
+					preset = "none",
+					["<S-Tab>"] = { "select_prev", "snippet_backward", "fallback" },
+					["<Tab>"] = { "select_next", "snippet_forward", "fallback" },
+					["<CR>"] = { "accept", "fallback" },
+					["<C-space>"] = { "hide", "show" },
+					["<C-y>"] = { "show", "show_documentation", "hide_documentation" },
+					["<C-u>"] = { "scroll_documentation_up", "fallback" },
+					["<C-d>"] = { "scroll_documentation_down", "fallback" },
+				},
+			})
+		end,
+	},
+}